Question

Which is f(-1) for the function f(x)= 3x^2+9

A. f(-1)=0
B. f(-1)=6
C. f(-1)=12
f(-1)=18

Answer 1

C. f(-1) =12

Explanation:

f(x)= 3x^2+9

Let x=-1

f(-1) = 3(-1)^2 +9

= 3(1)+9

= 3+9

= 12

f(-1) =12