C1 Jan 2006 Markscheme

Question Scheme Marks number

1. [pic] Factor of x. (Allow [pic]) M1 [pic] Factorise 3 term quadratic M1 A1 (3) Total 3 marks

2. (a) [pic] B1 [pic] For [pic], ft [pic] B1ft, B1 (3) (b) [pic] B1ft (1)

Total 4 marks

3. (a) [pic] (or equivalent verification) (*) B1 (1) (b) Gradient of L is [pic] B1 [pic] (ft from a changed gradient) M1 A1ft [pic] (or equiv. with integer coefficients) A1 (4) Total 5 marks

Question Scheme Marks number

4. (a) [pic] M1: [pic] M1 A1 (2) (b) [pic] M1: [pic] M1 A1 A1 (3) [pic] First A1: [pic] Second A1: [pic]

Total 5 marks

5. (a) 3(5 (or a = 3) B1 (1) (b) [pic] M1 [pic] (Used as or intended as denominator) B1 [pic] (Independent)