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math

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how do you solve this can you do this with the steps do I an understand them,please.

(x-9)^2=81

  • math -

    The way it sits, both sides are a perfect square, so yo simply take the square root of both sides.
    (x-9) = ± 9
    x = 9 ± 9
    x = 0 or x = 18

    or

    you could expand it ....

    x^2 - 18x + 81 = 81
    x^2 - 18x = 0
    x(x - 18) = 0
    x = 0 or x = 18

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