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Question

must be added to a2+2ab to make it a perfect square.

A
b
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B
a2
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C
2ab
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D
b2
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Solution

The correct option is D b2
To make (a2+2ab) a perfect square, b2 must be added,
since (a2+2ab+b2) = (a+b)2 which is a perfect square.

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