Factorise both the questions
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Answer: (1+ab+a-b)(1+ab-a+b)
Step-by-step explanation:
1)
(1-a²)(1-b²)+4ab = 1-a²-b²+a²b²+4ab
=(1+2ab+a²b²) - (a²+b²-2ab) [by rearranging the terms]
=(1+ab)²- (a-b)²
=(1+ab+a-b)(1+ab-a+b) [as this is in the form a²-b² = (a+b)(a-b)
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