Given f(x)=5+6x-x^2 find and simplify.

A)f(t-2)=____?
B)f(z+h)-f(z)=____?
C)f(b)+3=_____?

just substitute in for x

f(t-2) = 5+6(t-2)-(t-2)^2 = -t^2 + 10t - 11

do the others the same way.