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Math Help - unFOILing

  1. #1
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    unFOILing

    how do you unFOIL the following?

    -xsquared+x+12=0


    Im not sure how to do this because the x squared was negative. I thought it was:

    (-x+4)(x+3)

    So x would equal what? negative 4 or positive 4 since the x beside the four is negative?

    Thank You!!!
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  2. #2
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    Quote Originally Posted by greg9510 View Post
    how do you unFOIL the following?

    -xsquared+x+12=0


    Im not sure how to do this because the x squared was negative. I thought it was:

    (-x+4)(x+3)

    So x would equal what? negative 4 or positive 4 since the x beside the four is negative?

    Thank You!!!
    Hi greg9510,


    -x^2+x+12=0

    -(x^2-x-12)=0

    -(x-4)(x+3)=0

    (-x+4)(x+3)=0

    -x+4=0 \ \ or \ \ x+3=0

    x=4 \ \ or \ \ x=-3
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