Math methods yearr 11

The rate of change of the curve f(x) = -x^4 + 4x^2 +2x at x= -2 is?

Please show working out :))
Ciao thanks

Rate of change is the derivative so -4x^3+8x+2 is ther derivative

-4 (-2)^3 -16+2
-4(-8)-14
32-14
18=y'(2)