Mathematics

Recent Answers

2009-11-20 Basic Math - completing the square in quadratic equations,cubic equations,graphs:

Hi Richard, I'm glad you asked a follow-up. Regarding "completing the squares", let me try explaining it in another way. I'll focus more on the procedure this time. If you need to understand why something

2009-11-19 Basic Math - Percentages & Fractions:

I think what we looked at last time is not unrelated to the question that you now pose. Recapping on what we have done -- previously, we considered the problem of finding a multiplicative factor (X/Y)

2009-11-19 Calculus - Critical Numbers:

f(x)=x^4-6x^2+2 f'(x)=4x^3-12x f'(x)=0 : 4x^3-12x=0 --> x(4x^2-12)=0 . Solutions : x1=0, x2=√3, x3=-√3 . These are the critical points . f''(x)=12x^2-12 . f''(0)=-12 --> -12<0 then x1=0

2009-11-19 Basic Math - cube:

Let the cube root of 5000 be x. What this means is that x*x*x = 5000. This is not a pleasant number to work out in the head. To find x, may I suggest that you compute (5000)^(1/3) on a calculator.

2009-11-19 Calculus - maximizing revenue:

Questioner: Terry Country: Canada Category: Calculus Private: No Subject: calculus, maximizing revenue Question: Demand for a good is given by P=100*e^(0.00125X) （$p/unit, x units/month）