Note the pattern
i^1 = i
i^2 = - 1
i^3 = -i
i^4 = 1
So....all we need to do is to divide each exponent by 4, thusly
22/4 = 5 + 2/4 the numerator of the fraction = 2..... tells us where i^22 falls in the pattern = -1
And....likewise
222/4 = 55 + 2/4 = -1
So
i^22 + i^222 =
-1 + -1 =
-2