A1 for each, must be correct answers...no ft. coordinates ... lose 1 mark A2 (ii) x = 2, x = 5 must have both solutions (ft answers from part (a) earns 1 mark) B1 (b) x2 4x +8 = x + 4 – allow one slip in manipulation M1 y = x + 4 Straight line to be clearly stated A1 [6] M51. (a) 4 B1 (b) (32 4 4 5 5) (÷ 2) or 14 – – – – or 16 4 5 – – or equivalent M1 7 A1 [3] M52. Any correctly evaluated counter example with non-prime conclusion. Examples and 5 => 25 and not prime –4
A1 for each, must be correct answers...no ft. coordinates ... lose 1 mark A2 (ii) x = 2, x = 5 must have both solutions (ft answers from part (a) earns 1 mark) B1 (b) x2 – 4x +8 = x + 4 allow one slip in manipulation M1 y = x + 4 Straight line to be clearly stated A1 [6] M51. (a) 4 B1 (b) (32 – 4 – 4 – 5 – 5) (÷ 2) or 14 or 16 – 4 – 5 or equivalent M1 7 A1 [3] M52. Any correctly evaluated counter example with non-prime conclusion. Examples –4 and 5 => 25 and not prime