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Math Help - Factoring and the Quadratic Formula

  1. #1
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    Factoring and the Quadratic Formula

    Yeah...kinda forgot i had this over the weekend, and forgot how to do it. Oops. Anyway...
    We're supposed to factor if possible, and then solve with the quadratic formula. I think i got the factoring done, but i can't figure the rest out for the life of me.

    -2x+6x+9

    -4x^2+8x-2
    Factor by two...
    -2x^2+4x-1
    -5x^2+5x+5
    Factor by five...
    -x^2+x-1
    2x^2+6x-9

    x^2+6x-3

    did i do the factoring right? and what do i have to do after?
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  2. #2
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  3. #3
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    Ok.. i see now. I just couldn't tell what was a/b/c. Thanks!

    Now.. how do you determine the plus-or-minus thing?

    And does anyone know a way to memorize the quadratic formula aside from Pop Goes the Weasel? :P
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  4. #4
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    Quote Originally Posted by Nightfire View Post
    Now.. how do you determine the plus-or-minus thing?
    You do 2 seperate equations, one with the plus, the other with the minus.
    This should give 2 different values for x.
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