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8 October, 19:36

Solve x2+10x+21=0 ... ?

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  1. 8 October, 19:38
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    X²+10x+21=0

    / / = 10²-4*1*21

    / / = 100 - 84

    / / = 16

    x = (-10+/-//16) / 2

    x = (-10+/-4) / 2

    x' = (-10+4) / 2 = - 6/2 = - 3

    x" = (-10-4) / 2 = - 14/2 = - 7

    S: {-3; - 7}
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