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Question
Factorise:
(2a - 3)2 - 2 (2a - 3) (a - 1) + (a - 1)2
Solution
(2a - 3)2 - 2 (2a - 3) (a - 1) + (a - 1)2
= [(2a - 3) - (a - 1)]2
= [2a - 3 - a + 1]2
= (a - 2)2
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