Step-by-step explanation:
f'(x)=x^2f(x)
f''(x) = 2x. f(x) + x² . f'(x)
f''(4) = 2(4) . 8 + 4² . [4². 8]
= 8 . 8 + 16 [ 16 . 8]
= 2112
