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30 November, 14:25

What is the solution set of 2x 2 + x = 15?

{3, - 5/2}

{-3, 5/2}

{2, - 3/2}

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Answers (1)
  1. 30 November, 15:41
    0
    2x 2 + x = 15

    2x 2 + x - 15 = 0

    (2x - 5) (x+3) = 0

    2x-5=0

    x = 5/2

    x+3=0

    x=-3

    answer {-3, 5/2}

    (second choice)
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