Respuesta :

Step-by-step explanation:

Given

f(x) = - x² - 9x - 7

f(3) = -( 3) ² - 9 * 3 - 7

= - 9 - 27 - 7

= -43

Hope it will help :)

Plug in 3 for x.
f(3) = -(3)^2 - 9(3) - 7
f(3) = -43