Rearrange formulae where the new subject appears twice
Algebra in GCSE Maths involves lots of rearraning things to find the value of something we didn't know before. In this case the value we want appears in the equation twice, and we need to figure out how to rearrange to make those two our new subject.
We need to know how to rearrange an equation when the subject appears twice.
The goal here is no different from rearranging simpler maths formulae.
The important thing to recognise is that, at some point, you will have to collect the subject terms together so there is only one. This makes it a higher level problem.
How you collect the terms will depend on the maths problem type. It may be as simple as adding or subtracting like terms. The more complex maths problems will expect you to factorise at some point.
Here's an example question:
Rearrange the following to make F the subject
A = rF – 5F
First factorise to get F on its own
A = F(r – 5)
Finally divide both sides by (r – 5)
F= A/(r−5)
There are lots of different styles of equestions which will ask you to rearrange them, so why not test yourself and try some of the past paper questions in our 'Test Questions' tab?
And if you need a little extra help, don't worry, we have a community of people waiting to help you, just ask a question and maths problems will become a thing of the past!
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