The area of the rectangle of length x units and breadth y units is xy square units. If length is increased by 5units and breadth is decreased by 3 units, then area of new rectangle is
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length will be x + 5
breadth will be y - 3
new area of rectangle = l x b
= (x + 5) (y - 3)
= x(y - 3) + 5(y - 3)
= xy - 3x + 5y - 15
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