O-LevelMathematicsNumber4024/12 · Oct/Nov 2025 · Q164 Marks
Expand and simplify. (3+√2)(1+4√2)
- (a)Expand and simplify. (3+√2)(1+4√2)[2]
- (b)Rationalise the denominator. 1/(1+√7)[2]
Mark scheme
Marking points from the official mark scheme (Oct/Nov 2025). The mark or mark type is shown in brackets.
- [2] (a) 11+13√2 final answer
- [2] (a) B1 for 3+√2+12√2+4√2×√2 or better
- [2] (b) (-1+√7)/6 final answer
- [2] (b) M1 for x (1-√7)/(1-√7) or x (√7-1)/(√7-1)
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