Q. 174.8( 4 Votes )

# Find the smallest

Answer :

Given: (1 + i)2n = (1 – i)2n

Consider the given equation,

(1 + i)2n = (1 – i)2n

Now, rationalizing by multiply and divide by the conjugate of (1 – i)

[(a + b)2 = a2 + b2 + 2ab & (a – b)(a + b) = (a2 – b2)]

[i2 = -1]

(i)2n = 1

Now, i2n = 1 is possible if n = 2 because (i)2(2) = i4 = (-1)4 = 1

So, the smallest positive integer n = 2

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