Edexcel Mathematics June 2018 · Paper 2 · Question 3 · ExamRizz

ExamRizzEdexcel MathematicsMathematics

June 2018 · Paper 2 · Question 3 · 5 marks

3. (a) “If m and n are irrational numbers, where m ≠ n, then mn is also irrational.” Disprove this statement by means of a counter example. (2) (b) (i) Sketch the graph of y = |x| + 3 (ii) Explain why | x| + 3  |x + 3| for all real values of x. (3) 7

Lesson: Proof by Deduction