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30 June, 12:07

6y^3-150y ... x^3-10x^2+21x

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  1. 30 June, 15:20
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    6y^3-150y=0 / : y

    6y^2-150=0

    y^2=150/6

    y^2=25

    y1=5

    y2=-5

    x^3-10x^2+21x=0 / : x

    x^2-10x+21=0

    D = (-10) ^2 - 4*1*21 = 100 - 84 = 16

    x1 = (10 + 4) / 2*1 = 7

    x2 = (10 - 4) / 2*1 = 3
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