For questions related to usage of Wolfram Alpha.

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3
votes
0answers
199 views

How to Create a Lesson Plan with Wolfram Alpha

This will be my first post in this forum. I am so excited to see a lot of interesting posting from the community. From the FAQ, I learned that Mathematics stack exchange discussed about mathematical ...
4
votes
1answer
706 views

Is Wolfram Alpha Wrong? (LU Decomposition)

Ok, I've been working on a matrix solver for a while (no, its not going well, thanks for asking), and just discovered something that worrys me alot; The problem at hand is LU Decomposition of a ...
11
votes
2answers
30k views

How to type logarithms in Wolfram|Alpha?

Its sometimes hard to type it if logarithm is not natural and base is not 10, especially if base is variable. So anyone know rules how to type?
2
votes
2answers
698 views

limit of $2^n/3^{n/2}$ as $n\to\infty$

$$ \lim_{n\to\infty}\frac{2^n}{3^{n/2}}$$ I used wolfram to get the limit as follows: "lim n tends infinity 2^n/3^(n/2)". And using L'Hospital's rule the result was: ...
13
votes
2answers
377 views

What is the meaning of a number's “representation” on Wolfram Alpha?

When searching a number on Wolfram Alpha, one of the results is its representation. For example, for 8549: 8549 has the representation 8549 = $5·2^6·3^3-91$. Similarly for 75290: ...
2
votes
2answers
690 views

Comparing integral resolutions using Wolfram Alpha / Mathematica

Equations are in $\LaTeX$ format; I'm still trying to understand how MathJax works. Given the following integral: $\int_0^{+\infty } \frac{1}{x \sqrt{x}} \, dx$ I'm pretty sure that does not ...
0
votes
2answers
218 views

$f(x) = f(x-1)*b \to f(x) = c_1 b^{x-1}$

I'm trying to teach myself mathematics. I only started last year with a previous knowledge of basic arithmetic. I often make a detour into regions featuring problems that are a bit too deep for me. ...
1
vote
1answer
391 views

WolframAlpha Returns only 2 Roots for a Polynomial Equation of 6 Degree

I think this is really weird. I want to solve the following equation: $$(2x^2+3x+5)^3+(2x^2+3x+5)^2=0$$ This is a polynomial equation of 6 degrees. It should have 6 roots. But wolframalpha only ...
2
votes
2answers
1k views

Wolfram Alpha: How to show functions with abs() and sgn() as a piecewise function?

I was trying to obtain this result: integrate e^|x| dx The result is $$ \int e^{|x|} dx = \frac12 e^{-x} \left( (e^x-1)^2 \operatorname{sgn}(x) -2e^x +e^{2x} - ...