Prove that (n+3)2−(n−3)2(n + 3)^2 - (n - 3)^2(n+3)2−(n−3)2 is a multiple of 6 for all integer values of nnn
257 exam-style questions on Edexcel A Level Maths Algebraic Methods, covering 7.1 Algebraic Fractions, 7.2 Dividing Polynomials, 7.3 The Factor Theorem, 7.4 Mathematical Proof, and 7.5 Methods of Proof. Each one has a worked solution and a mark scheme showing where the marks go.