Question

if f(t)= 3t^2-2, find f(k-2)

Answer 1

By plugging (k-2) in t, we can write that
$f(k-2)=3(k-2)^{2}-2=3(k^{2}-4k+4)-2=3 k^{2}-12k+12-2=$$3 k^{2}-12k+10$