Question

If ƒ (x ) = 2x 2 + 3, find ƒ (3).
A.31
B.15
C.21
D.39

Answer 1

f(3)=2*3²+3=18=3=21
C is the answer

Answer 2

just plug in what x equals, as they tell you.

f(x) = 2x² + 3     f(3)

f(3) = 2(3²) + 3
f(3) = 2(9) + 3
f(3) = 18 + 3
f(3) = 21

c. 21 is your answer

hope this helps, God bless!