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Question

What is to be added to make 4x2+12xy+8y2 a perfect square?

A
8y2
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B
y2
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C
7y2
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D
4y2
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Solution

The correct option is B y2
4x2+12xy+8y2=(2x)2+2(2x)(3y)+(3y)2y2=(2x+3y)2y2
Therefore, y2 should be added.

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