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Question
Factorise the following, using the identity a2 – 2ab + b2 = (a – b)2.
9x2 – 12x + 4
Sum
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Solution
We have,
9x2 – 12x + 4
= (3x)2 – 2 × 3x × 2 + 22
= (3x – 2)2
= (3x – 2)(3x – 2)
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Chapter 7: Algebraic Expression, Identities and Factorisation - Exercise [Page 234]
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