Given that n∈Nn \in \mathbb{N}n∈N, use algebra to prove by contradiction that
“if n2+6n+3 is even, then n is odd”\text{“if } n^2 + 6n + 3 \text{ is even, then } n \text{ is odd”}“if n2+6n+3 is even, then n is odd”
Practise Edexcel A Level Maths 1.1 Proof by Contradiction with exam-style questions for A Level Maths. 100 questions, matched to the Edexcel A Level Maths (9MA0) 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.