S steezin Apr 2010 25 0 May 27, 2010 #1 What is the derivative of f(x) = -x^2 + 4x - 10 / (x^2 - 3x - 4)^2 I calculated it to be f'(x) = (-2x + 4)(x^2 - 3x - 4)^2 - (-x^2 + 4x - 10)(2)(x^2 - 3x - 4)(2x-3) / (x^2 - 3x - 4)^4 apparently this is wrong according to graphing technology.

What is the derivative of f(x) = -x^2 + 4x - 10 / (x^2 - 3x - 4)^2 I calculated it to be f'(x) = (-2x + 4)(x^2 - 3x - 4)^2 - (-x^2 + 4x - 10)(2)(x^2 - 3x - 4)(2x-3) / (x^2 - 3x - 4)^4 apparently this is wrong according to graphing technology.

skeeter MHF Helper Jun 2008 16,216 6,764 North Texas May 27, 2010 #2 steezin said: What is the derivative of f(x) = -x^2 + 4x - 10 / (x^2 - 3x - 4)^2 I calculated it to be f'(x) = (-2x + 4)(x^2 - 3x - 4)^2 - (-x^2 + 4x - 10)(2)(x^2 - 3x - 4)(2x-3) / (x^2 - 3x - 4)^4 apparently this is wrong according to graphing technology. Click to expand... it's not wrong, just needs an algebra clean-up ... your syntax may be where the problem lies.

steezin said: What is the derivative of f(x) = -x^2 + 4x - 10 / (x^2 - 3x - 4)^2 I calculated it to be f'(x) = (-2x + 4)(x^2 - 3x - 4)^2 - (-x^2 + 4x - 10)(2)(x^2 - 3x - 4)(2x-3) / (x^2 - 3x - 4)^4 apparently this is wrong according to graphing technology. Click to expand... it's not wrong, just needs an algebra clean-up ... your syntax may be where the problem lies.