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29 January, 03:02

X^2 - 19x + 90 = 0 Factor and solve

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  1. 29 January, 03:20
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    Find what 2 numbers multiply to get 90 and add to get - 19

    they must be both be negative so

    factor 90

    90

    1,90

    2,45

    3,30

    5,18

    9,10

    add

    1+90=91

    2+45=47

    3+30=33

    5+18=23

    9+10=19 correct

    numbers are - 9 and - 10 since negative times negative=positive

    so

    it factored out to

    (x-9) (x-10) = 0

    set each to zero

    x-9=0

    add 9

    x=9

    x-10=0

    add 10

    x=10

    x=9 or 10
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