Two-variable factorisation for evaluation

Two-variable factorisation for evaluation

Secondary 2
5 marks
TGM Original Questions
  1. Factorise \(12a^2+7ab-10b^2\) completely.[3]
  2. 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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