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
52 exam-style questions on AQA GCSE Maths Rearranging Harder Formulae. Each one has a worked solution and a mark scheme showing where the marks go.