a (a-1) -b (b-1) ?____
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Answer:
(a-b)(a+b-1)
Step-by-step explanation:
a(a-1) - b(b-1)
= a²-a-b²+b
= a²-b²-a+b
=(a+b)(a-b) - (a-b)
= (a-b)(a+b-1)
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