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Question
Factorise the following, using the identity a2 – 2ab + b2 = (a – b)2.
4y2 – 12y + 9
Sum
Solution
We have,
4y2 – 12y + 9 = (2y)2 – 2 · 2y · 3 + 32
= (2y – 3)2
= (2y – 3)(2y – 3)
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Chapter 7: Algebraic Expression, Identities and Factorisation - Exercise [Page 234]
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