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27 December, 11:29

Find three consecutive odd integers such that three times the square of the first integer is twelve more than the product of the second and the third integers

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  1. 27 December, 11:34
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    Consecutive odd integers are 2 apart

    they are

    n, n+2, n+4

    3 (n²) = 12 + (n+2) (n+4)

    expand

    3n²=12+n²+6n+8

    3n²=n²+6n+20

    minus n² both sides

    2n²=6n+20

    divide bot sides by 2

    n²=3n+10

    minus 3n+10 both sides

    n²-3n-10=0

    factor

    (n-5) (n+2) = 0

    n-5=0

    n=5

    n+2=0

    n=-2

    has to be odd, so no

    n=5

    n+2=7

    n+4=9

    the integers are 5,7,9
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