Question

Over which interval is the graph of f(x) = –x2 + 3x + 8 increasing?

(–∞, 1.5)
(–∞, 10.25)
(1.5, ∞)
(10.25, ∞) pls help

Answer 1

Hello,

Answer A: (-infini,3/2)
Vertex is (3/2,41/4) and the curve is turning its concavity down.
f'(x)=-2x+3=0==>x=3/2

Answer 2

graphing the equation, it is increasing at (–∞, 1.5)