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20 October, 08:08

Solve 2x2 + 3x - 7 = x2 + 5x + 39 for x.

A. x=-6 + or - the square root of 82

B. x=-6 + or - 2 with the square root of 17

C. x=1 + or - the square root of 33

D. x = 1 + or - the square root of 47

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Answers (1)
  1. 20 October, 10:10
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    2x2 + 3x - 7 = x2 + 5x + 39

    2x2 + 3x - 7 - x2 - 5x - 39=0

    x2 - 2x - 46 = 0

    (x-1) 2 - 46 - 1 = 0

    (x-1) 2 - 47=0

    (x-1) 2 = 47

    x-1 = + or - the square root of 47

    x = 1 + or - the square root of 47
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