Question 37546
Original: 4i^206+5(sqrt(-196))-8i^18

4(i^206)+5(sqrt(196)i)-8 (i^2)^9
= 4 (i^2)^103 + 5(14i)-8(-1)^9
=4(-1)^103 + 70i - (-1)
=4(-1)+70i+1
=-4+70i+1
=-3+70i
Cheers,
Stan H.