Question

Hello could you help me on this calculus

Answer 1

Hello,

d f(x²-1)/dx=f'(x²-1)*2x
if x=2 then f'(2²-1)*2*2 =f'(3)*4=-4*4=-16

Answer A

If you need explains:

let's y=x²-1

df(x²-1)/dx=df(y)/dy*(dy/dx)=f'(x²-1)*2x