Questions tagged [calculator]

Questions regarding calculators such as the TI-83 (Plus), HP 50g, and other calculator models.

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37 views

Non-commutative multiplication on a calculator

I have a scientific calculator (Sharp EL-520R) that is usually reliable. However, I have recently come across this anomaly and hope that someone can explain it. The calculator displays ten digits ...
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1answer
59 views

Any good math calculators online to find inverse laplace transforms? Specifically $s\log\frac{s+4}{s-4}$

I think I have found the final answer $\left(4 \left[\frac{2t \cosh(4t) - \sinh(4t)}{t^2}\right]\right)$ but need to verify it.
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Is learning to calculate complex integrals really useful? [closed]

I am a high school student. I have taken the AP Calculus BC course. I scored a 5/5 on AP Calculus exam and completely mastered the concept of Integration using u substitution and other basic ...
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1answer
25 views

Logarithm value difference between calculator and table

Look at the example given at the bottom of the attached table. Log(0.003674) = -3.5652. I understand how this is procured from the log table. But if you use a calculator and plug in the numbers ...
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1answer
30 views

I am trying to find the zeroes of this polynomial

Polynomial: $$(8.0\times10^{29})(0.010-x)(1.99\times10^{-7}-4x)^4-x=0.$$ No matter what I do can't get the graph to show up on my calculator (TI-83 plus) when I use the graphing function, so I can'...
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1answer
22 views

For standard deviation of grouped data shouldn't you have to convert frequencies given in decimals (in millions) to whole numbers.

A client of mine in Finite Math received the following data and was asked to find the sample standard deviation. (Actually, they don't specify 'sample'. This class doesn't seem to teach population ...
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13 views

Compound Interest Formula for monthly deposits

I am currently developing a savings calculator to some set requirements, such as using a compounding interest formula. My calculator currently is annual interest only, and compounds only annually as ...
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33 views

TI Inspire CX CAS unable to do integral

Here is the math problem I am trying to do: So I want to take the integral of v(t) to get s(t) then solve for c. I typed in v(t) in my ti inspire cas, assuming it would simplify it down. However it ...
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1answer
13 views

TI Nspire CAS Implicit Differentiation not returning correct result (returning 0)

Taking the derivative of $y^3-xy=2$, the correct result should be $y'=y/(3y^2-x)$. However, when I use the impDif() function on TI Nspire CAS, the returned result is 0, as shown in the screenshot ...
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2answers
52 views

Understanding a calculator: what does “sign” mean?

I put the following input into a ti-nspire cx CAS: and it returned: What does "sign" mean?
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3answers
66 views

Matrix Calculator Tools

Does there exist any such software/online calculator where I can enter a matrix and am able to obtain the formula for an arbitrary power of the matrix? It would be an added benefit if the entries of ...
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1answer
106 views

How to find percentile of exponential distribution with ti-84 [closed]

Hello I am taking an online statistics class as part of a nursing program that I am in and we are using a free online textbook from lumenlearning. I am currently learning about uniform and exponential ...
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4answers
133 views

Values of $\left (1+\frac{1}{n}\right )^n$ on a calculator

I was reading a calculus book, and at some point the following standard limit was mentioned: $$\lim_{n\to\infty}\left(1+\frac1n\right)^n=e$$ Afterwards, the author of this book invited the reader to ...
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23 views

Finding Poisson Critical Region with Casio CG-50

I am trying to figure out how to get the critical region for a Poisson distribution on a CG-50. On the classwiz, you could enter desired values into a table and the poisson value would be returned on ...
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31 views

Use of Multi-Statements (Casio fx-85GT)

The CASIO fx-85GT Plus has a 'colon' character which can be used to perform multiple statements in turn. The instruction manual gives the following example: (there is a similar description on the ...
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1answer
45 views

Are there formulas to find roots of n-th degree polynomials?

I have tried a polynomial equation of 7th degree on WolframAlpha but it didn't give me exact forms. Does this mean there are not general formulas for every polynomial equation and calculators use root-...
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1answer
79 views

How does the calculator solve definite integrals?

What process do most calculators use to calculate indefinite integrals? My teacher told me that calculators are really good at doing definite integrals, but they aren't so good at finding the ...
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1answer
24 views

help needed with a percentage calculation [closed]

so in this example when i calculate 10000+1% its shows 10100 but with my casio fx 991 es plus shows 10000.01 please help I'm stuck
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26 views

result in math mode like radicals and fractions on casio fx-992

I want to solve the equation $$ z^2 -(\sqrt{3} +\mathrm{i}\sqrt{2}) z + \mathrm{i} \sqrt{6}=0 $$ Using the casio fx-992 plus calculator. To do this, I followed the instructions given in this video: ...
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1answer
33 views

Scientific calculator that can expands polynomial like $(x^2+1)(x+1)(x-3)$

Is there a scientific calculator that can expands a polynomal like $(x^2+1)(x+1)(x-3)$? Any scientific calculator like Texas Instruments can do that?
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1answer
31 views

Which calculator will be useful here?

I want to factor the denominator of this expression $\frac{1}{bu^2-2au-b}$ so that I get this expression $-\frac{b}{(-bu+\sqrt{b^2+a^2}+a)(bu+\sqrt{b^2+a^2}-a)}$. I used hp 50g calculator with ...
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1answer
221 views

How do I round up on a TI-84+ [closed]

I'm using a TI-84+ and am trying to setup an equation that requires rounding up I know how to round and round down with the TI-84 but I can't seem to figure out how to round up Edit: the 'round ...
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0answers
99 views

Keeping the numbers in fraction only while Matrix Multiplication in a scientific calculator

While performing a matrix multiplication on my scientific calculator (CASIO fx-991ES PLUS), I realized that the calculator gives out the answers in decimals (approx. decimals in case of irrational ...
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1answer
58 views

$\sin\left(\frac{\pi}{16}\right)$ not working on Ti-89

If I ask TI-89 to evaluate a special angle like $\displaystyle \sin\left(\frac{\pi}{3}\right)$ or $\displaystyle \sin\left(\frac{\pi}{4}\right)$ I get back nice fractional results. But if I ask for ...
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32 views

3D Volume calculator of intersection body created with given equations?

As title says, anyone know 3D Calculator in which you can input equations of bodies and find volume of their intersection created body as shown: Equations of spheres: $x^2 + y^2 +z^2=1$ $x^2 + y^...
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1answer
127 views

system of equations calculator

I have a problem that is very simple in concept but very difficult to actually solve. I need to find the best fit polynomial of degree at most 4 for f(x)=ln(x) on the interval [1,4]. So far I have ...
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2answers
79 views

Is it possible for a calculator to be completely exact?

Once you have reached perhaps 10 decimal places, calculators can make rounding errors and so on. Is it possible to build a calculator that makes none of these errors? For example, it could work out ...
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2answers
80 views

Difficult to understand incomplete gamma function in the solution of 1st order Non-Homogeneous linear ODE.

I have solved manually this 1st order non-homogeneous linear ODE.$\frac{dy}{dx}+x^2*y(x)=5$ The solution is $\large e^{\frac{-x^3}{3}}*\int5*\large e^{\frac{x^3}{3}}dx$. HP 50g graphing calculator ...
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0answers
20 views

Calculating Uncertainty in simple linear and by calculator

How do you measure the uncertainty of m and c in y=mx+c by regression formulas in a calculator from a set of given data points (x,y)? I know the actual statistical formula, but that looks too ...
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1answer
53 views

Numerical error

My brother told me that when he did this operation in the calculator: "the 2^33 root of one natural number", he obtains exactly 1. He asked me why (because I am a math student) but I don't know the ...
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5answers
136 views

What Can We Say About the Continuity of $y=\frac{x}{x}$ at $x=0$?

If we can't divide by $0$, should $\frac{x}{x}$ be discontinuous and undefined at $x=0$ or is it continuous with value $1$? Most online graph calculators plot a continuous curve. If it's continuous ...
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1answer
61 views

Wrong result of integral $\int_{1}^3{\ln(x+1) \cdot \sin(x)}dx$ on calculator EL-W506X

I just solved on Khan Academy the following problem, which gives me on my calculator EL-W506X the wrong answer. Why is that? $$\int_{1}^3{\ln(x+1)\cdot \sin(x) dx} = 1.57079$$ (says on Wolfram Alpha),...
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1answer
43 views

How to graph $x^2+y^2=4$ on a TI-$84$? [closed]

I have a TI-$84$ and need to graph an equation that does not begin with $Y=$. How would I do this?
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2answers
72 views

Describe Number Naturally

I'm running some calculations on a calculator, and I'm getting a lot of "exponent of 10" results. I was hoping somebody could help me translate the results to a "normal" representation, so that I can ...
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30 views

calulator errors

My Sharp EL-531XH calculator appears to have a bug in the decimal to hex conversion, where any number with more than nineteen bits (>2^19) is in error. A few minutes produced the following table ... ...
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2answers
226 views

How should I calculate the square root of a complex number using a Casio 991EX?

With Casio 991EX how should I calculate the square root of a complex number? It says Math error even though is set in COMPLEX mode
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2answers
64 views

Three calculators work in different way when I calculate: 50 + 10% * 20%

I've been working on developing simple calculator and currently working on order of operations for percent symbols. So when I trying the following equation, three different calculators show different ...
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2answers
189 views

How to convert a calculator to be in degrees? [closed]

I have a calculator, specially the Casio fx-9750GII,but there is a "slight" error... When I put in, for example cos (76 I get the answer in radians. So, naturally as anyone that's not lazy would do ...
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37 views

How does a calculator perform division?

I wonder how does a calculator perform division , I know he calculate sin,cos and so on with Taylor series , just by adding number . But do you do division?
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1answer
87 views

Calculator Confusion using Windows and Androids

I just came across this calculation, it's really confusing. I ran the following calculations in windows and android calculators. $1/98\cdot 98 = 1$ $1/98 = 0.0102040816326531$ $0.0102040816326531 * ...
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1answer
153 views

Calculator will not find row reduced echelon form

I have a TI-84 Plus CE which I am using to find the row reduced echelon form of matrices. It has worked well so far, but it gives me an "Invalid Dimension" error for this matrix: $$\begin{pmatrix}1 &...
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2answers
103 views

DIvisibility Error in the TI-84

I am trying to factorize a large number, $$600851475143$$ So I just started trying primes and in my TI-84, I got that $$600851475143=61\cdot 9850024183$$ so then I got $$9850024183=7\cdot ...
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1answer
32 views

Steps for solving amortizing payment formula using handheld calculator

What are the steps for solving this equation on a handheld calculator? Where should I start? I know many calculators have functions to do this quickly, but this is more a question about using a ...
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325 views

TI-nspire CX CAS giving weird/incorrect indefinite integral

I am testing out the new TI-nspire CX CAS I just got with some simple indefinite integrals. I used the integral of $$ \int \sec^3(x) dx $$ My nspire gives me: $$ \frac{\cos^2(x)\ln\left(-\frac{|\...
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1answer
51 views

Calculator giving weird answer when dividing factorial

I am using a TI-34 MultiView I was trying to divide the following 20!/(17!3!) The answer should be 1140 right? the numerator is 2.43*10^18 the denominator ...
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0answers
28 views

Is there a way to input a variable (such as x) into my calculator for use with integrals or derivatives?

There is a button on my calculator dedicated to derivatives and integrals, but I've never been able to use it because I don't know how to represent a variable (it seems the only thing I can derive or ...
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2answers
88 views

Integrate $\int 2x\sin{(x^2+x)} \,dx$

Evaluate $\int 2x\sin{(x^2+x)} \,dx$ using integration by parts. Let $u=2x$ and $dv=\sin(x^2+x)dx$ and I got that $du=x^2dx$. I'm stuck when integrating $\sin{(x^2+x)}$. Then I tried the integral ...
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3answers
132 views

why cant algebra calculators without graphing involved solve this equation $2^x=3x-1$?

I know you can plug in 1 and get the answer, but im curious as to why some websites with algebra calculators cannot solve the equation unless the website has some sort of graphic calculator also ...
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4answers
4k views

How can $\frac{4}{3} \times 3=4$ if $ \frac{4}{3}$ is $1.3$? [duplicate]

Ok use your closest calculator, and type $\frac{4}{3}$, which is $1.3333333333$,and then multiply it with $3$ which is $3.9999999999$ but then type $\frac{4}{3} \times 3=4$ how?. How can it be $4$ if $...
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1answer
52 views

Writing Short Equations/Equivalents For A Group Of Numbers.

I have a series of numbers between 0 to 16,000,000. It's certainly possible to describe some (if not all) of these numbers with some equations. For example, it's possible to write 720 as 6! and 5040 ...

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