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Expansion of (x-y)^2

Four alternat...

Question

Four alternative options are given for each of the following statements. Select the correct option.

What would be added to a² + 2ab to make it a complete square?

A. b²

B. 2ab

C. ab

D. 2a

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Solution

It is known that .

Thus, b² should be added to to make it a perfect square.

Hence, the correct answer is A.

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