christianrettig christianrettig

08-06-2017
Mathematics

contestada

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

Respuesta :

Аноним Аноним

09-08-2017

f(x) = -x^2 + 3x + 8
f'(x) = -2x + 3

when f(x) is increasing f'(x) > 0

-2x + 3 > 0

-2x > -3

x < 3/2 or 1.5

So the required interval is (-infinity,1.5).The first choice.

Answer Link

isabellemcfaddor439x isabellemcfaddor439x

10-08-2017

The answer is A (-infinity, 1.5)

Answer Link

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