Question

Factories : a ( a - 1 ) - b ( b - 1 )

Answer 1

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↪a(a-1)-b(b-1)

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➡ a²-1 - b²+1

➡ a²-b²-1+1

➡ a²-b² {-1 & +1 are cancelled}

➡ (a+b)(a-b)

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