Make u u\,u the subject of the formula 1f=1u+1v\displaystyle \frac{1}{f} = \frac{1}{u} + \frac{1}{v}f1=u1+v1
Practise AQA GCSE Maths Rearranging Harder Formulae with exam-style questions for Foundation and Higher tier. 52 questions, matched to the AQA GCSE Maths (8300) specification and written in Paper 1, Paper 2 and Paper 3 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.