Question

Plzzzzzz helpppp me

Answer 1

15.

start by replacing x with 3

so your equation now would look like

f(3)= (3)^2+5(3)-9

next start by doing exponents

f(3)= 9+5(3)-9

now you can do multiplication

f(3)= 9 + 15 - 9

add everything together

9 + 15 -9

your answer is 15. hope this helps

Answer 2

15

Explanation:

Just substitute x in the equation

so x=3

so

3^2=9, 5x3=15, -9

equals 15