Over which interval is the graph of f(x) = –x2 + 3x + 8 increasing? (–∞, 1.5) (–∞, 10.25) (1.5, ∞) (10.25, ∞) pls help

asked Dec 19, 2018 38.4k views

5 votes

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

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

8.9k points

Please log in or register to add a comment.

4 votes

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

Mohammed Asim answered Dec 21, 2018

9.3k points

5 votes

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

Anemo answered Dec 26, 2018

by Anemo

6.9k points

Welcome to QAmmunity.org, where you can ask questions and receive answers from other members of our community.

9.5m questions

12.2m answers