Question

Over what interval is the graph of f(x) = -(x + 8)2 – 1 decreasing?

(-8, 0)
(8,00)
(-2,8)
(-20, -8)

Answer 1

(-8, ∞)

Explanation:

The coefficient of x^2 is negative so the graph rises from the left until x = -8 and y = -1.

So it decreases from x = -8 to x = infinity.