Question

Factorise 1 + 2ab - (a2 + b2)

Answer 1

$\: \: \: \: \: 1 + 2ab - ( {a}^{2} + {b}^{2} ) \\ = 1 + 2ab - {a}^{2} - {b}^{2} \\ = 1 - ( {a}^{2} + {b}^{2} - 2ab) \\ = 1 - {(a - b)}^{2} \\ = {1}^{2} - {(a -b )}^{2} \\ = (1 + a -b )(1 -a +b ).$





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Answer 2

Hi friend your answer is above

Please mark it as brain list answer............

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