Factorise a² - b² - 2b - 1
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here is your answer
a2 – b2 - 2b – 1
= a2 – (b2 + 2b + 1)
= (a)2 – ( b + 1)2
= (a + b + 1) (a – b – 1)
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4
Answer:
(a-b-1) (a+b+1)
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