Determine Net change and average rate of change

Question

F(x)= 1-3x^2; x=4, x=4+h. Determine the a) net change and b) average rate of change.

Answer 1

net change = 1 -3(4+h)^2 -( 1-3(4)^2 ) = 1-1 -48 +48 -24h -3h^2 =-24h -3h^2

average rate of change = net change divided by h = -24 -3h