Question

Factorize a(a-1) - b( b-1)​

Answer 1

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Answer 2

$\huge{\mathfrak{\red{Answer}}}$

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