Use the graph of f(x) = – (x + 4)(x – 5) shown to find the solution set of – (x + 4)(x – 5) ≤ 0.
On a coordinate plane, a parabola opens down. It goes through (negative 4, 0), has a vertex at (0, 20), and goes through (5, 0).
What is the solution set of –(x + 4)(x – 5) ≤ 0?
A.(–4, 5)
B.[–4, 5]
C.(–∞, –4) U (5, ∞)
D.(–∞, –4] U [5, ∞)
