Edexcel Mathematics October 2020 · Paper 2 · Question 1 · ExamRizz

ExamRizzEdexcel MathematicsMathematics

October 2020 · Paper 2 · Question 1 · 5 marks

1.5 2 2.5 y 0.5774 0.7071 0.7746 0.8165 0.8452 (a) Use the trapezium rule, with all the values of y in the table, to find an estimate for x xx10525 +∫d .. giving your answer to 3 significant figures. (3) (b) Using your answer to part (a), deduce an estim ate for 9 10525 x xx+∫d .. (1) Given that 9 10525 x xx+∫d .. = 4.535 to 4 significant figures (c) comm ent on the accuracy of your answer to part (b). (1) 3

Lesson: Locating Roots by Change of Sign