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15 April, 18:03

What is the positive root of the equation x 2 - 2x = 120

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Answers (2)
  1. D
    15 April, 20:01
    0
    X²-2x=120

    x²-2x-120=0

    (x+10) (x-12) = 120

    x=-10, 12
  2. B
    15 April, 21:07
    0
    There is a shortcut.

    It can be converted to (x-1) ^2 = 121

    If you know 121 = 11^2

    Then you get x-1 = 11 or - 11, so x = 12 or - 10
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