factouser a-b-a²+b².
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Step-by-step explanation:
a - b - a² + b²
= a - b - (a² - b²)
Using, a² - b² = (a+b)(a-b)
= a- b -(a+b)(a-b)
= (a-b) [ 1 - (a+b)]
= (a-b)( 1 - a - b)
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