How do you factor completely a^2 - 1 - 4b^2 - 4b?
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Here 1 is only the constant term and the factors of 1 are +1 and -1.
Put 1 and -1 at the place of a and due to which factor you will get zero the factor opposite to the sign will be ur answer.
On putting -1 u will get zero.
therefore it answer will be (a+1)
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