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f(x) = x(x-2)^2View attachment 59739 help in part iv
f'(x) = (x-2)(3x-2) [or equivalent]
You want to find the minimum value for this gradient function. Simple! Just find it as if it were any other function. (ie differentiate it, find when derivative of this is zero, etc)
So:
f''(x) = 6x - 8 [or equivalent??]
f''(X) = 0
x = 8/6 = 4/3
substitute into gradient function:
f'(4/3) = -4/3