Paper 2 · Algebra, factorising, equations
Factorise completely 3a-ab-2b+6.
Model answer
(a+2)(3-b)
Also accepted: (3-b)(a+2)
Explanation: (3a+6)-(ab+2b)=3(a+2)-b(a+2)=(a+2)(3-b).
Derived from ZIMSEC Mathematics Paper 2, November 1999, Q2
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