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Question

Let n be a natural number. The number of n's for which (n4 + 2n3 + 2n2 + 2n + 1) is a perfect square is


A

1

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B

2

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C

7

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D

0

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Solution

The correct option is D

0


For N to be a perfect square, since (n+1)2 is already a perfect square, n2 + 1 must be a perfect square.

But there is no n (natural number) such that n2 + 1 is a perfect square and hence N is a perfect square for no natural number.


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