What must be added to 4x2+8x, to make it a perfect square?
A
4
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B
8
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C
16
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D
2
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Solution
The correct option is A 4 We know that, 4x2+8x=(2x)2+2×(2x)×2 Adding 4 on both sides gives, 4x2+8x+4=(2x)2+2×(2x)×2+4 Since, 4x2+8x+4=(2x+2)2 4 is to be added to 4x2+8x to make it a perfect square.