Edexcel Mathematics October 2021 · Paper 1 · Question 7 · ExamRizz

ExamRizzEdexcel MathematicsMathematics

October 2021 · Paper 1 · Question 7 · 9 marks

7. The circle C has equation x2 + y2 − 10x + 4y + 11 = 0 (a) Find (i) the coordinates of the centre of C, (ii) the exact radius of C, giving your answer as a simplified surd. (4) The line l has equation y = 3x + k where k is a constant. Given that l is a tangent to C, (b) find the possible values of k, giving your answers as simplified surds. (5) 19 20 21

Lesson: Equations of a Straight Line