Given .Find where h is not equal to zero
Attempt:
How to simplify (please provide steps)
Thank you
To learn, in general, how to evaluate a function at an expression (rather than a number), try here.
Then try working this exercise in pieces, rather than all at one. First write down the formula for f(x). Then find the expression for f(x + h). Then subtract the polynomial for f(x) from the polynomial for f(x + h). Then divide by h, cancelling if you can.