Two-variable factorisation for evaluation
Two-variable factorisation for evaluation
Secondary 2
5 marks
TGM Original Questions
- Factorise \(12a^2+7ab-10b^2\) completely.[3]
- Hence evaluate \(12(13)^2+7(13)(7)-10(7)^2\) without expanding the squares directly.[2]
Solution:
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Answer:(a) \((4a+5b)(3a-2b)\) (b) \(2175\).
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