Question

F (x)=-4x^2+9 find f(-3)​

Answer 1

-27

Explanation:

to find f(-3) we must substitute x to -3 in the f(x)= -4x² +9

f(-3) = -4(-3)² +9

f(-3) = -4*9 +9

f(-3) = -36 +9

f(-3) = -27

Answer 2

`f(x) = - 4 {x}^(2) + 9 \\ \\ f( - 3) = - 4 ({ - 3}^(2) ) + 9 \\ = -4 (9) + 9 \\ = - 36 + 9 \\ = - 27`

I hope I helped you^_^