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Question

Prove that (2x3y)(2x+3y)=(2x)2(3y)2 geometrically.

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Solution

Step 1: Draw a square and cut into 3 parts.
Step 2: There are 1 hided square green and 2 rectangles (pink, blue)
Step 3: Area of the full square = (2x)2(3y)2
Step 4: Now we have to find the area of rectangle as shown in the figure.
Step 5: Consider the area of pink rectangle = length × breadth = 2x(2x3y)
Step 6: Area of blue rectangle = 3y(2x3y)
Step 7: Area of full square = area of pink rectangle + area of blue rectangle.
i.e., (2x)2(3y)2=2x(2x3y)+3y(2x3y)
(2x)2(3y)2=(2x+3y)(2x3y)
Hence, geometrically we proved the identity (2x)2(3y)2=(2x+3y)(2x3y).
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