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19 June, 23:54

Solve for x by completing the square:

x^2+10x+9=0

x = 1, x = 9

x = - 1, x = - 9

x = 11, x = - 21

x = - 11, x = 21

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Answers (1)
  1. 20 June, 01:39
    0
    X^2 + 10x = - 9

    (x+5) ^2 - 25 = - 9

    (x+5) ^2 = 16

    x+5 = + / - 4

    x = - 1, x = - 9
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