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Help with Factorising Algebraic Expressions (1 Viewer)

HelloIAmGone

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How do you factorise a2-b2-a+b?

The answers state (a-b)(a+b-1), and whilst trying to work out the question I got up to "(a+b)(a-b)-(a-b)" but have no idea on what to do next... complete mindblank rn x-x
 

InteGrand

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How do you factorise a2-b2-a+b?

The answers state (a-b)(a+b-1), and whilst trying to work out the question I got up to "(a+b)(a-b)-(a-b)" but have no idea on what to do next... complete mindblank rn x-x
 

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