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Math Help - Changing the subject in an equation

  1. #1
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    Changing the subject in an equation

    Hi,
    I know how to change the subject of the formula in an equation like u=v+2t, but I get confused when the equation is for example p=5xyz+5ab^2 making x the subject.
    This is the answer I got:

    p - 5ab^2= 5xyz
    p - 5ab^2/5yz= x

    x = p - 5ab^2/5yz

    Was wondering if i could get some advice on whether the answer is correct and my steps as to how I got it are correct because I have a feeling I have made a mistake.

    Thank you
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  2. #2
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    Re: Changing the subject in an equation

    Quote Originally Posted by poochie03 View Post
    Hi,
    I know how to change the subject of the formula in an equation like u=v+2t, but I get confused when the equation is for example p=5xyz+5ab^2 making x the subject.
    This is the answer I got:

    p - 5ab^2= 5xyz
    p - 5ab^2/5yz= x

    x = p - 5ab^2/5yz

    Was wondering if i could get some advice on whether the answer is correct and my steps as to how I got it are correct because I have a feeling I have made a mistake.
    parentheses around your numerator and denominator ...

    x = (p - 5ab^2)/(5yz)

    ... now you're done.
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