if the the length of a rectangle is (5x²+3x+6) and the breadth is (7x+9) then fine it's perimeter
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perimeter = 2 ( length + breath)
= 2 { ( 5x^2 + 3x + 6) + (7x+9)
= 2 ( 5x^2 + 10x + 15)
= 10x^2 + 20x + 30
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