3. Two adjacent sides of a rectangle are 3x ²- 5y²and 7x ²- xy. Find its perimeter.
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Answer:
20x²-10y²-2xy
Step-by-step explanation:
It's perimeter=2(l+b)
=2(3x²-5y²+7x²-xy)
=2(10x²-5y²-xy)
=20x²-10y²-2xy(Ans)
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