# Write down the in

Given:

Length of the farm, l = (2a2 + 3b2) m

Breadth of the farm, b = (a2 + b2) m

Side of the square plot, s = (a2 - b2) m

To find: Area of remaining farm

Explain:

Area of Remaining Farm = Area of Rectangle – Area of Square

Area of Rectangle = l × b

= (2a2 + 3b2) × (a2 + b2)

= 2a2.a2 + 2a2.b2 + 3b2.a2 + 3b2.b2

= 2a4 + 5a2b2 + 3b4

Area of Square = s × s

= (a2 - b2) × (a2 - b2)

= a2.a2 – a2.b2 – a2.b2 + b2.b2

= a4 – 2a2b2 + b4

Area of Remaining Part = (2a4 + 5a2b2 + 3b4) – (a4 – 2a2b2 + b4)

= 2a4 + 5a2b2 + 3b4 - a4 + 2a2b2 - b4

= a4 + 7a2b2 + 2b4

Therefore, the area of remaining portion is = a4 + 7a2b2 + 2b4

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