Show that (6+5)(6−5)13=311313\displaystyle \frac{(6 + \sqrt{5})(6 - \sqrt{5})}{\sqrt{13}} = \frac{31\sqrt{13}}{13}13(6+5)(6−5)=133113
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217 exam-style questions on CCEA GCSE Maths Surds. Each one has a worked solution and a mark scheme showing where the marks go.