O-LevelMathematicsAlgebra and graphs4024/12 · Oct/Nov 2014 · Q184 Marks
Factorise completely 4a - 16a².
- (a)Factorise completely 4a - 16a².[1]
- (b)Factorise 9b² - c².[1]
- (c)Factorise x² - 5y - xy + 5x.[2]
Mark scheme
Marking points from the official mark scheme (Oct/Nov 2014). The mark or mark type is shown in brackets.
- [1] (a) 4a(1 - 4a)
- [1] (b) (3b - c)(3b + c)
- [2] (c) (x + 5)(x - y)
- [2] B1 for one of the partial factorisations x(x - y); 5(x - y); x(x + 5); y(x + 5), or their negatives.
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