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Question
Factorise the following, using the identity a2 – 2ab + b2 = (a – b)2.
a2y2 – 2aby + b2
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Solution
We have,
a2y2 – 2aby + b2
= (ay)2 – 2 × ay × b + b2
= (ay – b)2
= (ay – b)(ay – b)
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