Changing the subject - aaargh! Anyone be able to help?xx

Changing the subject - aaargh! Anyone be able to help?xx

Answers
Would that be "changing the subject of an equation"? As in y=f(x), rearrange the equation in the form x=f(y)?
ianmoth
16 April 2012
yes, I'm fine with things like that, it's when it gets more complex as in T=mv * mv / r + mg and making r the subject
flossiefisher
17 April 2012
I don't want the answers to the questions, I'd just like to know which order you should do the things in so I can work them out
flossiefisher
17 April 2012
As a general rule, move all the terms with r in them (where r is the variable you want as the subject of the equation) onto the left, and everything else on the right. Factorize the LHS and simplify so r appears only once. Multiply and/or divide both sides of the equation so that r is on its own on the LHS. Unfortunately this won't hold for every example, but dealing with the tricky ones will be easier after lots of practice. Bear in mind that some equations can't be manipulated to change the subject.
ianmoth
17 April 2012
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