1.5 Surds

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If n is a integer that is not a square number, then any multiple of √n is called a surd. Surds are examples of irrational numbers. The decimal expansion of a surd is never-ending and never repeats, for example √2=1.414213562... In this lesson you learn about surds, rational and irrational surd, simplifying surds division, third rule of surds, expanding brackets with surds.