Question

F(x)=x-4x^2 and h≠0
F(x+h)

Answer 1

F(x+h) = (x+h) - 4(x+h)^2

Explanation:

You would just plug in x+h for x:

F(x+h) = (x+h) - 4(x+h)^2

= x + h - 4(x^2 + 2xh +h^2)

= x + h - 4x^2 - 8xh - 4h^2