a²+2ab-2b-1 বীজগাণিতিক রাশিটির একটি উৎপাদক -

A a+1

B b+1

C a-2

D a-1

Solution

Correct Answer: Option D

a²+2ab-2b-1
=a²-1+2ab-2b
=(a+1)(a-1)+2b(a-1)
=(a-1)(a+1+2b)
=(a-1)(a+2b+1)

∴a²+2ab-2b-1  এর উৎপাদক (a-1)

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