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Math Help - changing the subject of a formula

  1. #1
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    Post changing the subject of a formula

    P = ∏ (pie)r + 2r + 2a
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  2. #2
    is up to his old tricks again! Jhevon's Avatar
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    Quote Originally Posted by vtaylor View Post
    P = ∏ (pie)r + 2r + 2a
    please say what you want to be the new subject, is it a or r?
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    Smile sorry it is the r

    oh im sorry it is the r
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  4. #4
    is up to his old tricks again! Jhevon's Avatar
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    Quote Originally Posted by vtaylor View Post
    P = ∏ (pie)r + 2r + 2a
    changing the subject of the formula to r means we want to get r on one side of the equal sign by itself. a simple enough concept, in practice, it can be not so simple.

    P = ∏r + 2r + 2a ..............first step, get rid of the 2a from the right
    => P - 2a
    = ∏r + 2r ..........i subtracted 2a from both sides
    =>
    P - 2a = r(∏ + 2) ........i factored the r out
    => (P - 2a)/(
    ∏ + 2) = r ....i divided both sides by (∏ + 2)

    so r =
    (P - 2a)/(∏ + 2)
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