O-LevelMathematicsAlgebra and graphs4024/12 · Oct/Nov 2017 · Q224 Marks
Factorise 9a² – 6a.
- (a)Factorise 9a² – 6a.[1]
- (b)Factorise 4 – 25t².[1]
- (c)Factorise 6cd – xy + 2cx – 3dy.[2]
Mark scheme
Marking points from the official mark scheme (Oct/Nov 2017). The mark or mark type is shown in brackets.
- [1] 22(a) 3a(3a - 2)
- [1] 22(b) (2-5t)(2 + 5t)
- [2] 22(c) (x + 3d)(2c - y)
- B1 for one of the partial factorisations: x(2c-y), 3d(2c – y), 2c(x + 3d), -y(x + 3d ), y(x + 3d )
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