Question

if f(x) = 3-x^2, find f(3a)
explain please (:

Answer 1

just substitute 3a in place of x
f(3a)=3-(3a)^2
=3-9a^2

Answer 2

right thats what i was doing...but why did you still keep the ^2 at the end?

Answer 3

\[3-9a^2\]
\[\because (a)^2=a^2\]