(x-9)^2=81
(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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