Over which interval is the graph of f(x) = –x2 + 3x + 8 increasing?
Asked by wiki @ in Mathematics viewed by 449 People
(–∞, 1.5)
(–∞, 10.25)
(1.5, ∞)
(10.25, ∞)
Answered by wiki @
The answer for this question is (-infinity,1.5) because
when f(x) is increasing f'(x) > 0
-2x + 3 > 0
-2x > -3
x< 3/2 or 1.5
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