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Math Help - Simultaneous equation

  1. #16
    Super Member Quacky's Avatar
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    Quacky's Guide to Factoring a Quadratic

    Quote Originally Posted by andyboy179 View Post
    so would i use 7 and 1, for example would i do 7x-1= -7 (i know that wouldn't fit but is it the correct way of doing it?)
    You have 3 and 1.
    You have 7 and 1.

    -Take one number from the top and one number from the bottom.
    -Pair them together and multiply them.
    -There will be 2 numbers left unselected.
    -Pair them together and multiply them.
    -See if you can add them or subtract them to obtain 4
    -If you can, place each paired number in an opposite bracket. You know which values are "stuck" to a y so then you just need to work out the signs.
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  2. #17
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    Re: Quacky's Guide to Factoring a Quadratic

    7-3=4 so that would be it and y= -7 or -3
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  3. #18
    Super Member Quacky's Avatar
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    Re: Quacky's Guide to Factoring a Quadratic

    Quote Originally Posted by andyboy179 View Post
    7-3=4 so that would be it and y= -7 or -3
    We know it's (3y\pm~)(y\mp~)

    Finish it up. Which numbers go in which brackets? Read through what I said above again if you get confused.
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  4. #19
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    Re: Quacky's Guide to Factoring a Quadratic

    (3y+7) (y+3)???
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  5. #20
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    Re: Quacky's Guide to Factoring a Quadratic

    actually it would be (3y - 7)(y + 1) = 0
    y= 7/3 or -1
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