Question

Please Help Me!!!
If f(x) = 2x2 - 30, find f(4).

35

-14

2

17

Answer 1

f(x) = 2x^2 - 30

f(4) = 2(4^2) - 30
f(4) = 2(16) - 30
f(4) = 32 - 30
f(4) = 2
basically, your just subbing in 4 for x

Answer 2

oh, thats what i forgot to do, i was having trouble because i forgot to substitute for BOTH x's thanx so much

Answer 3

no problem :)