Edexcel Mathematics June 2018 · Paper 2 · Question 11 · ExamRizz

ExamRizzEdexcel MathematicsMathematics

June 2018 · Paper 2 · Question 11 · 7 marks

11. 11 16 31 23 122+− −−≡+−+−xx xxAB xC x () () () () (a) Find the values of the constants A, B and C. (4) f (x ) = 11 16 31 22+− −−xx xx() () x > 3 (b) Prove that f (x ) is a decreasing function. (3) 31 32 33

Lesson: Laws of Indices