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Question
Factorise the following:
9y2 – 66yz + 121z2
Solution
9y2 – 66yz + 121z2
= (3y)2 – 2 × 3y × 11z + (11z)2
= (3y – 11z)2 ...[Using identity, a2 – 2ab + b2 = (a – b)2]
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