Question

a(a-1)-b(b-1) factorise​

Answer 1

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

Answer 2

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

= a²-a-b²+b

= a²-b²-a+b

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

= (a+b)²-(1)²(a-b)

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

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