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11 March, 01:39

When the square of a certain number is diminished by 9 times the number the result is 36?

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  1. 11 March, 04:13
    0
    X²-9x=36

    minus 36 both sides

    x²-9x-36=0

    what 2 numbers multiply to - 36 and add to - 9

    -12 and 3

    (x-12) (x+3) = 0

    set to zero

    x-12=0

    x=12

    x+3=0

    x=-3

    the number is either - 3 or 12
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