Answer:
f(3) = -20
Step-by-step explanation:
Replace each instance of x in 3^2x -9 =0 with 3:
f(x) = -2x2 + x-5 = f(x) = -2x^2 + x-5 (" ^ " represents "exponentiation")
f(3) = -2(3)^2 + 3 - 5
f(3) = - 18 - 2 = -20
