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30 June, 06:35

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

(-∞, 1.5)

(-∞, 10.25)

(1.5, ∞)

(10.25, ∞)

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Answers (1)
  1. 30 June, 10:07
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    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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