Question

The quadratic function f(x) = –x2 – 6x – 8 is graphed.


What are the solutions of the quadratic equation 0 = –x2 – 6x – 8?

2 and –4
–2 and 4
–2 and –4
2 and 4

Answer 1

Multiply both sides by -1: x^2 + 6x + 8 = 0.
Factor: (x + 2)(x + 4) = 0, so x = -2 or x = -4.

Answer: –2 and –4.