= 3 & = -1 M1 x x Substitute into = 2 y x – = 1 and = -3 y y = 3 = 1 x y or = -1 = -3 A1 x y (Total 5 marks) Question 20. Express (2 3)2 in the form + where and are integers to be found. – b c3, b c (2 3) (2 3) P1 – – 4 23 23 + 3 M1 – –
x = 3 & x = -1 M1 Substitute into y = x – 2 y = 1 and y = -3 x = 3 y = 1 or x = -1 y = -3 A1 (Total 5 marks) Question 20. Express (2 – 3)2 in the form b + c3, where b and c are integers to be found. (2 – 3) (2 – 3) P1 4 – 23 – 23 + 3 M1
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