Find the value of x for which the function f(x) = 2x\(^3\) - x\(^2\) - 4x + 4 has a maximum value

montty

10 years ago

The ans is C

There is a mistake in guys solution....the roots of that quadratic is -2/3 and 1 not 2/3 and -1

Craig Duffy

9 years ago

RUBBISH... D ANSWER IS -2/3. solve it again and again, and u will gt d answer correctly..

iMLG

2 years ago

this is wrong, there was an error in the solving for the quadratic equation as they got (3x-2) (x+1) instead of the correct one which is (3x+2) (x-1) making x=1 and x = -2/3. max value < 0, 12x - 2 = 0, 12(1) - 2 = 10 which means 1 cant be the right answer. at x = -2/3. 12(-2/3) - 2 = 0, -24/3 -2 =0, -8 -2 =-10 which is less than 0, meaning that the correct answer is C (-2/3).

Emmytoks123

4 years ago

This is very wrong nah!!! The answer should be -2/3

omoadeleye

11 years ago

for quick answer, replace x = 1 and do the pheripherance.

Chuks612

9 years ago

Therefore the answer is B nah.