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

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Factorise a(a-1)-b(b-1)
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Namrata Jindal 5 years, 5 months ago

= a^2 - a - b^2 - b = a^2 - b^2 - ( a + b) = (a+b)(a-b) -1(a+b) = (a+b)(a-b-1)
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