Question

If f(x) = -2x2 + x-5, what is f(3)?

Answer 1

f(3) = -20

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