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22 July, 17:02

What numbers multiply up to 81 and add to 36?

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  1. 22 July, 17:08
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    A) x * y = 81

    B) x + y = 36

    A) x = 81 / y Substituting this into B)

    B) 81/y + y = 36 Multiplying both sides by y

    81 + y^2 = 36y

    y^2 - 36y + 81 = 0

    Solving by quadratic formula

    x1 = 33.5885

    x2 = 2.4115
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