the side of a rectangular field are x²+3 meter and x²-4 meter find the area and perimeter
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Area = l×b
= x² +3 × x² - 4
=x⁴ + 3x² - 4x² -12
= x⁴ - x² - 12
Perimeter = 2(l+b)
=2 × (x²+3 + x² - 4)
=2× (2x² - 1)
= 4x² - 2
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