Recent content by sgonzalez90

The summation index is n so 0 to inf and i is an imaginary number. In all the problems we have seen we are given z because z = x + iy, but here none is given..so I'm unsure if it should just be zero or if we should assume this is z^u or u^z? I'm not sure, the professor didn't specify.

Ʃ(2+3i)^(2+i)n Since there is no declared z (complex analysis) in this problem would we take this differentiation with respect to n? If so, my answer was Ʃ n(2+3i)^(2+i)n-1

ROC = |z+5i| < inf? :D

Good evening, I'm an electrical engineering student questioning my answer to this series Region of Convergence problem. Ʃ(0,inf) (n(n-1)(z+5i)^n)/n Using the ratio test lim n-> |an+1/an| I was able to get it down to lim n->|n(z+5i)/(n-1)| which gave |inf/inf| = 1, which means the test...

Homework Statement 40<50degrees + 20<-30 degrees, I get how to convert to rectangular, I got 43.03 + j20.64, but converting it back to polar... how exactly do you do so? The answer is 47.72<25.63degrees... my book doesn't explain it. Also with (2+j4)(3-j5)... how exactly do you...

40<50degrees + 20<-30 degrees, I get how to convert to rectangular, I got 43.03 + j20.64, but converting it back to polar... how exactly do you do so? The answer is 47.72<25.63degrees... my book doesn't explain it. Also with (2+j4)(3-j5)... how exactly do you tackle this sort of...