The sides of a rectangle are (3x + 5y) and (5x – 7y). Find its area.
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Adjacent sides in rectangle are lenght and base
Perimeter of rectangle =2(length+breadth)
Perimeter =2(3x²−5y²+7x²−xy)
Perimeter =2(10x²−5y²−xy)
Perimeter =20x²−10y²−2xy.
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