1. The problem statement, all variables and given/known data Need to see if what im doing is right, here is the problem: z= 4i/(-1+i), express z^20 in standard form. so, z= 4i/(-1+i) = 2-2i z^20 = 2*sqrt(2) x cis[20(-pi/4)] = 2*sqrt(2) x cis(-5pi) = 2*sqrt(2) x [cos(-5pi) + i sin(-5pi)] = 2*sqrt(2) x [-1 + 0i] = 2*sqrt(2) x [-1] = -2048 so the final answer is only a real number of magnitude -2048+0i. is this correct? thanks.