math

x^2=8x-9
solve by completing the square to obtain exact solutions

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  1. x^2 - 8x + .... = -9 + ....
    x^2 - 8x + 16 = -9 + 16
    (x-4)^2 = 7
    x-4 ± √7
    x = 4 ± √7

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