Posted by cavs on September 25, 2002 at 12:00:53:
Need help!!!!!!!
x^3 + 4 - 5i =0
x^3=-4 + 5i
I was able to change it to trigonometric form and got the reference angle of 128.70
The radius I believe is ^3sqrt41?????? =3.44821724=3.45
I use the formula a= x/n + 360(k)/n
I got 42.9 + 120(0)=42.9
42.9 + 120(1)=162.90
42.9 + 120(2)= 282.9
so you should get:
3.45(cis 42.9)
3.45(cis 162.90)
3.34(cis 282.90)
Looks good but I kept getting the wrong answer. What is wrong!!!