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Math Help - factor problem.

  1. #1
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    factor problem.

    Im toward the end of this problem im practicing...

    finding the domain of this function


    the answer is x cant be -5 or -4, and i factored it all the way to this point....
    but i dont see how they get -5 and -4.... i know its something easy im missing
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  2. #2
    Super Member Matt Westwood's Avatar
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    So you factored x^2 + 9x + 20 and you got (x+5)(x+4).

    So that's what you have on the bottom of your fraction.

    Now you can't have 0 on the bottom of a fraction, it's naughty.

    So any value of x which makes the bottom zero is not allowed.

    So whatever values of x that make (x+5)(x+4) = 0 are not in the domain of the function.

    Hence the result given.
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  3. #3
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    ohhh, gotcha. Thank you
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