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1d
comment How to solve equations to the fourth power?
I am that old. But I used substitution and quadratic. Now I need to get good at the other methods, my second career is in a math center, as a tutor, and brushing up on all 4 years of HS math.
2d
comment How to solve equations to the fourth power?
@John - "look for 2 numbers that multiply to 1296, and add to -153" - that would be the advice for my students, right? Followed by factoring the 1296 to see the candidates. (thx)
2d
comment How to solve equations to the fourth power?
@John - of course it works, but how did you quickly notice the middle term can be split like that? Or rather, how long did it take you to figure it?
Aug
25
comment Where did I go wrong in my evaluation of the integral of cosine squared?
Can you not solve it without the transformation to cos(2x)?
Aug
25
comment What is the Probability that the remaining marble from the same bag is also white given 3 bags each containing 2 marbles.?
I edited, please respond if it's now understood.
Aug
25
revised What is the Probability that the remaining marble from the same bag is also white given 3 bags each containing 2 marbles.?
added 146 characters in body
Aug
25
answered What is the Probability that the remaining marble from the same bag is also white given 3 bags each containing 2 marbles.?
Aug
24
answered Geometry - Trapezium and its properties
Aug
20
answered $ \frac{x+1}{9x^3-4x} + \frac{3x}{27x^3 - 12x + 8} - \frac{1}{(3x-2)^2}=0 $
Aug
19
comment $ \frac{x+1}{9x^3-4x} + \frac{3x}{27x^3 - 12x + 8} - \frac{1}{(3x-2)^2}=0 $
By graphing, you can at least discover there is one solution, and it's about 1.519493, give or take.
Aug
18
comment Squares of a number yields a palindrome?
+1 - it's a magical thing to make these discoveries on your own. When you find them yourself, you gain an appreciation of what the Greek mathematicians discovered a long time back.
Aug
16
reviewed No Action Needed Find the exact value of the trigonometric function
Aug
16
reviewed No Action Needed Riemann Zeta continued fraction approximants
Jul
21
comment Using triple integrals to find volume
Isn't this a cube with sides just less than1?
Jul
13
reviewed No Action Needed Differentiation of a modulus function
Jul
13
reviewed No Action Needed How many different functions are there that are equal to their own inverse?
Jun
30
comment Probability of a group of people voting yes or no
I agree. Gender doesn't matter. What are odds that jurors 1-3 vote yes, and 4-8 vote no? 1/256
Jun
20
comment Efficient elevator strategy
Does the building belong to the same company? If anyone from 4/5/6/7 needs to visit 8/9/10/11/12 regularly, you will find a contingent of people look to harm the software guy who arranged this.
Jun
20
comment Efficient elevator strategy
Why does 2 get special treatment?
Jun
19
revised Fuzzy Logic - Defuzzification
editted picture in