The length and breadth of a rectangle are 4x² -y² and 3x² + 7y². Find the perimeter of rectangle.
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Perimeter of a rectangle= 2(length+breadth)
= 2(4x²- y²+ 3x² + 7y²)
=2(4x²+3x²+7y²-y²)
=2(7x²+6y²)
=14x²+12y².
Thus, perimeter of the rectangle is 14x²+12y²
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