Question

let f(x)=8x^2+8x+2 Find f (x+h)-f(x)

Answer 1

Plug x+h in :
f ( x+h) = 8 ( x+h)² + ...?

Answer 2

8(x+h)+2

Answer 3

f ( x+h) = 8 ( x+h)² + 8(x+h)+2
Now expand it out:

Answer 4

im lost

Answer 5

( x+h)² = x² + 2hx + h²
-> 8 ( x+h)² + 8(x+h)+2 = ....?