Question

9. Show that n^2+ n + 1 is not divisible by5
for any n, where it is a natural number​

Answer 1

Answer:

P(x) = n² +n + 1

Let n =1

1² + 1 + 1 = 3

Let n = 2

2² + 2 + 1 = 4 + 2 + 1 = 7

So, n² + n + 1 is not equal to 5

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