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Math Help - transpositions

  1. #1
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    transpositions

    This ones beyond me!!

    Make x the subject:

    y=(x+4)(x+3)

    if anyone can explain this one to me i would be forever grateful
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  2. #2
    GAMMA Mathematics
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    Quote Originally Posted by chrill911 View Post
    This ones beyond me!!

    Make x the subject:

    y=(x+4)(x+3)

    if anyone can explain this one to me i would be forever grateful
    Good question!

    y=(x+4)(x+3)\Rightarrow y=x^2+7x+12

    x^2+7x+12-y=0

    Now, use the quadratic formula...

    x=\frac{-7 \pm \sqrt{49-4(12-y)}}{2}

    x=\frac{-7 \pm \sqrt{1+4y}}{2}
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  3. #3
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    Cheers for that!!!

    I gotta admit i dont fully understand the quadratic formula, but it's a step in the right direction!! Time to hit the books and do some more research.....

    Thanks a lot
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