Factorise by grouping method : a 2 + b - ab - a

Given, a 2 + b - ab - a = a 2 - ab - a + b = a(a - b) - 1(a - b) = (a - 1)(a - b). Hence, a 2 + b - ab - a = (a - 1)(a - b).

Mathematics

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Given,

a² + b - ab - a

= a² - ab - a + b

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

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

Hence, a² + b - ab - a = (a - 1)(a - b).

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