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9 November, 20:41

A+B = - 7 and AXB = - 15

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  1. 9 November, 22:19
    0
    A+b=-7

    ab=-15

    a=-7-b

    b (-7-b) = - 15

    a=-7-b

    -b^2-7b+15=0

    a=-7-b

    b^2+7b-15=0

    a=-7-b

    b = (-7±sqrt (109)) / 2

    1)

    a=-7-b

    b = (-7+sqrt (109)) / 2

    b = (-7+sqrt (109)) / 2

    a=-7+3.5-sqrt (109) / 2

    b = (-7+sqrt (109)) / 2

    a=-3.5-sqrt (109) / 2

    2)

    a=-7-b

    b = (-7-sqrt (109)) / 2

    b = (-7-sqrt (109)) / 2

    a=-7+3.5+sqrt (109) / 2

    b = (-7-sqrt (109)) / 2

    a=-3.5+sqrt (109) / 2
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