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16 August, 15:14

X^2 + 18x + c = 25 + c

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  1. 16 August, 15:28
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    Rearrange to: x^2 + 18x - 25 = 0

    Then factorise (I like to do it by completing the square):

    (x + 9) ^2 - 81 - 25 = 0

    (x + 9) ^2 = 106

    x + 9 = sqrt (106)

    The sol'ns are:

    x = - 9 + and - sqrt (106)
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