(x 4)(x + 4) B1 – (2x + 3)(x 4) or – = = M1 where ab ±12 or 2b + a –5 (2x + + a)(x b) 22 + 4 2x x A1 + 3 or or or or M1 oe oe × × or × M1 or 0.166... or 0.277... or 0.17 or 0.28 23 × + × + × M1 1 × – oe or A1 0.72(2..) Q Additional Guidance Mark 23 Accept decimals (3n + 5)(n 1) or 3n × M1 n – (3n + 5)(n 1) 3n × M1dep n – – 3n2 − 3n + 5n − 5 − 3n2 3n(n−1) 24 A1 Denominator used − or 3n2 + 2n− 5 3n2 3n(n−1) Q Additional Guidance Mark
22 (x – 4)(x + 4) B1 (2x + 3)(x – 4) or (2x + a)(x + b) M1 where ab = ±12 or 2b + a = –5 x + 4 2x + 3 A1 23 or or or or M1 oe × or × or × M1 oe 0.166... or 0.277... or 0.17 or 0.28 × + × + × M1 1 – × or A1 oe 0.72(2..) Q Additional Guidance Mark 23 Accept decimals 24 (3n + 5)(n – 1) or 3n × n M1 (3n + 5)(n – 1) – 3n × n M1dep 3n2 − 3n + 5n − 5 − 3n2 3n(n−1) or 3n2 + 2n− 5 − 3n2 3n(n−1) A1 Denominator used Q Additional Guidance Mark
November-2014-Paper-2-Mark-Scheme1.docx