What must be added to the expression (4a^2 + 9b^2) so that the sum is a perfect square?

1. What must be added to the expression (4a^2 + 9b^2) so that the sum is a perfect square?

[Officer (IT) 2016 [MCQ and Written] : 2016]

1. 6ab

2. 12ab

3. 18ab

4. 24ab

5. 8ab

Answer

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