1.

What is that least number that must be added to the product 684 × 686 to make it a perfect square?1). 6852). 13). 6844). 686

Answer»

684 × 686 = 684 × (684 + 2) = 6842 + 2 × 684

To make it PERFECT square we should add 1

⇒ 6842 + 2 × 684 × 1 + 12 = (684 + 1)2

So ANS is 1.


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