Question

If f(x) = 2x2 − 10, find f(5).

90

10

7.5

40

Answer 1

f(x) = f(5) so x = 5. Plug 5 in x and solve.

Answer 2

You need to plug in the 5 for all the x terms in the equation

If you plug it in, you get f(5)= 2(5)^2 -10
10^2
100-10 = 90
f(5)=90