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29 September, 23:03

What are 3 consecutive integers whose product is - 120

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  1. 30 September, 00:05
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    Consecutive integers are 1 apart

    x, x+1, x+2

    (x) (x+1) (x+2) = - 120

    x^3+3x^2+3x=-120

    add 120 to both sides

    x^3+3x^2+3x+120=0

    factor

    (x+6) (x^2-3x+20) = 0

    set each to zero

    x+6=0

    x=-6

    x^2-3x+20=0

    will yeild non-real result, discard

    x=-6

    x+1=-5

    x+2=-4

    the numbers are - 4,-5,-6

    use trial and error and logic

    factor 120

    120=2*2*2*3*5

    how can we rearange these numbers in (x) (y) (z) format such that they multiply to 120?

    obviously, the 5 has to stay since 2*5=10 which is out of range

    so 2*2*2*3 has to arrange to get 3,4 or 4, 6 or 6,7

    obviously, 7 cannot happen since it is prime

    3 and 4 results in in 12, but 2*2*2*3=24

    therfor answer is 4 and 6

    they are all negative since negaive cancel except 1

    the numbers are - 4,-5,-6
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