math help people lik really desperate!!
posted by annaiiz on .
ok i have to divide complex numbers:
question is: 1-2i+i^3/1+i
this is what i did:
my answer is -2i-1
is that right?
Be more specific with parentheses. Does the 1+i divide into only the i^3 term? Or does it divide into 1 - 2i + i^3?
from what you showed in your work I will asssume you meant
you messed up in your first line.
remember i^3 = i(i^2) = i(-1) = -i
= (1-2i - i)/1+i)
now multiply top and bottom by 1-i to get
(1-4i - 3i^2)/(1 - i^2)
= 2 - 2i