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Math Help - Help with changing subjects!

  1. #1
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    Help with changing subjects!

    im having trouble in changing subjects for equations, such as
    4n-3nsquared= -1.. is there like a simple formula for changing the numbers around so it makes sense as in axsquared+bx+c=0?
    I usually just do simple math to figure where each number goes like for 4n-3nsquared= -1, i usually think about 4-5=1 and rearrange it to make the equation make sense in the form of axsquared+bx+c=0...
    This is for quadratics, so if the question is in the form of axsquared+bx+c=0, then its very easy to solve.

    Can someone please help me with this?

    Thanks in advance.
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  2. #2
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    Quote Originally Posted by xanith_47
    im having trouble in changing subjects for equations, such as
    4n-3nsquared= -1.. is there like a simple formula for changing the numbers around so it makes sense as in axsquared+bx+c=0?
    I usually just do simple math to figure where each number goes like for 4n-3nsquared= -1, i usually think about 4-5=1 and rearrange it to make the equation make sense in the form of axsquared+bx+c=0...
    This is for quadratics, so if the question is in the form of axsquared+bx+c=0, then its very easy to solve.

    Can someone please help me with this?

    Thanks in advance.
    If you mean,
    4n-3n^2=-1
    Multiptly by -1 but sides to get,
    3n^2-4n=1
    Subtract 1 thus,
    3n^2-4n-1=
    Thus,
    \left\{ \begin{array}{c}{a=3\\b=-4\\c=-1\end{array}\right

    Then use quadradic formula.
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  3. #3
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    Apr 2006
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    wow easier than i thought. Thanks alot
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