Hi! I'm having trouble with this math question; can someone help? Thanks! :)

Given the function f(x)=x^2+9, solve.

a.) Find f(-3)
b.) Find f(x-2)

a)

so use -3 for x

(-3)^2 + 9 = 9+9 = 18

b)
now use -2 for x
(-2)^2 + 9 = 4 + 9 = 13