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Find all real solutions to the equation? ?

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x^4-13^2+36=0

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  1. u=x^2

    u^2 - 13u + 36 = 0

    (u-4)(u-9)=0

    u = 4 or 9

    x^2 = 4 x=+/- 2

    x^2 = 9 x = +/- 3

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