Question

a-b-a- a2+b2
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Answer 1

a - b - a - 1a² + b²

-b - 1a² + b²

-1a² + b² - b

$\large\pink{\fbox{Hope \: it's \: help \: you}}$

Answer 2

The correct answer is (a - b) (1 - a - b)

Steps involved

a - b - a2 + b2

= (a-b) - (a2 - b2)

= (a - b) - (a + b)(a - b)

= (a - b) {1 - (a + b)}

= (a - b) (1 - a - b)