P = ∏ (pie)r + 2r + 2a

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- April 15th 2007, 08:50 AMvtaylorchanging the subject of a formula
P = ∏ (pie)r + 2r + 2a

- April 15th 2007, 09:59 AMJhevon
- April 15th 2007, 10:23 AMvtaylorsorry it is the r
oh im sorry it is the r

- April 15th 2007, 11:00 AMJhevon
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)