Edexcel Mathematics October 2020 · Paper 2 · Question 3 · ExamRizz

ExamRizzEdexcel MathematicsMathematics

October 2020 · Paper 2 · Question 3 · 5 marks

3. (a) Given that 2 log (4 − x) = log (x + 8) show that x2 − 9x + 8 = 0 (3) (b) (i) W rite down the roots of the equation x2 − 9x + 8 = 0 (ii) State which of the roots in (b)(i) is not a solution of 2 log (4 − x) = log (x + 8) giving a reason for your answer . (2) 7

Lesson: Exponential Functions and Their Graphs