Factorise: ab-a-b
+1. Please explain it too.
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Answer:
(b-1)(a-1)
Step-by-step explanation:
ab-a-b+1
=a(b-1)-1(b-1)
[taking a common from ab and -a]
[taking -1 common from -b and 1 to make it same as b-1]
=(b-1)(a-1)
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