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Math Help - working out a quadratic - and +

  1. #1
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    working out a quadratic - and +

    Hello,

    Here it is:

    x ^2-12x+20

    I have figured out that the product and sum is 2 and 10. make 12, times together to make 20. however i dont know how to continue from there.

    thanks
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  2. #2
    is up to his old tricks again! Jhevon's Avatar
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    Quote Originally Posted by Sphinxy1994 View Post
    Hello,

    Here it is:

    x ^2-12x+20

    I have figured out that the product and sum is 2 and 10. make 12, times together to make 20. however i dont know how to continue from there.

    thanks
    more specifically, -2 * -10 = + 20 and -2 + (-10) = -12

    thus, x^2 - 12x + 20 = (x - 2)(x - 10)


    also, see the relevant link in my signature to learn how to use LaTeX
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  3. #3
    MHF Contributor

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    So your equation is now (x- 2)(x- 10)= 0 and the only way a product of numbers can be 0 is if one of the numbers is 0 itself.
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