Let us assume the given complex number be

Multiplying and dividing with 1+i

⇒

⇒

We know that i²=-1

⇒

⇒

⇒

⇒

We know that i^2k is real for k>0.

So, the smallest positive integral ‘n’ that can make real is 2.

∴ The smallest positive integral value of ‘n’ is 2.