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1 July, 03:52

How do i factor s^2+9s=-20

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  1. 1 July, 04:06
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    To factor you have to do this:

    s^2 + 9s = - 20

    + 20 + 20

    s^2 + 9s + 20 = 0

    now you need to numbers that multiplied give you 20

    and then those same 2 numbers have to add to 9

    5 x 4 = 20

    5 + 4 = 9

    (x + 4) (x + 5)

    that means that x = - 4, and - 5
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