Factorise : x (x − a ) − y ( y − a )
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(2x-a) -(2y-a ). hehehe this is my brain answer don't take it seriously
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x ( x − a ) − y ( y − a )
= x² - ax - y² + ay
= x² - y² - ax + ay
= ( x + y ) ( x - y ) - a ( x - y )
= ( x - y ) ( x + y - a )
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