Question

Question is in the image. I need help with #19

Answer 1

EXPLANATION

Replacing the given functions into the following:

`(f(x+h)-f(x))/(h)`
`(x^2-1+h-(x^2-1))/(h)`

Removing the parentheses and simplifying:

`(x^2-1+h-x^2+1)/(h)`

Simplifying like terms:

`(h)/(h)=1`

Hence,

`(f(x+h)-f(x))/(h)=1`