Question

factorise a-b-a square+b square​

Answer 1

Step-by-step explanation:

$a - b - {a}^{2} + {b}^{2} \\ a - b - ( {a}^{2} - {b }^{2} ) \ \\ (a - b) - ((a - b)(a + b)) = 0 \\ (a - b)(1 - a - b)$