1.

n is a natural number. Which number is to be added to n2 + 6n. So as to get a perfect square always.

Answer»

n2 + 6n + 9 = n2 + 2 x n x 3 = 32

= (n + 3)2 which is a perfect square.

Hence, we have to add 9 in n2 + 6n to gent a perfect square.



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