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Factorise The Expression By Hand

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HOW CAN I SEE ON DISPLAY (FACTORISE THE EXPRESSION BY HAND)( X - 4 )( X + 5 ) - ( X - 40 )
= X2 + 5X - 4X - 20 - ( X - 40 )
= X2 + X - 20 - X + 40
= X2 + 20
NIKOLINA
11/2/2008 11:07:05 PM - HR | comment


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