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CBSE Class 9 Answered

Factorise: a(a-1)-b(b-1)
Asked by nisha_vini29 | 15 Mar, 2017, 05:49: PM
answered-by-expert Expert Answer

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

= a2 - a - b2 + b

= a2 - b2 + b - a

= (a - b)(a + b) - (a - b)

= (a - b) (a + b - 1)


Answered by | 15 Mar, 2017, 05:54: PM

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