Posted by annaiiz on Wednesday, April 1, 2009 at 9:56pm.
ok i have to divide complex numbers:
question is: 12i+i^3/1+i
this is what i did:
12i+i(i)/1+i
12ii^2/1+i
12ii(1)/1+i
12i+i/1+i
13i/1+i*1i/1i
1i3i+3i^2/1i+ii^2
1i3i+3(1)/1i^2
1i3i3/1(1)
14i3/2
24i/2
my answer is 2i1
is that right?

math help people lik really desperate!!  carpediem, Wednesday, April 1, 2009 at 10:07pm
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?

math help people lik really desperate!!  Reiny, Wednesday, April 1, 2009 at 10:32pm
from what you showed in your work I will asssume you meant
(12i+i^3)/(1+i)
you messed up in your first line.
remember i^3 = i(i^2) = i(1) = i
so
(12i+i^3)/(1+i)
= (12i  i)/1+i)
= (13i)/(1+i)
now multiply top and bottom by 1i to get
(14i  3i^2)/(1  i^2)
= (44i)/2
= 2  2i
Answer This Question
Related Questions
 check my work please!  ok i have to divide complex numbers: question is: 12i+i...
 Maths complex numbers  Find tan(3 theta) in terms of tan theta Use the formula...
 Math  The average of X numbers is 15. If the sum of the X numbers is 90, what ...
 Question (PLEASE READ!!!)  What website is when you can ask any questions and ...
 math  This was on my test and have a few more question that is from my test. 18...
 Math  I am having some trouble with this problem: What characteristics do the ...
 Math  Hot numbers in a lottery are numbers that keep coming up. Cold numbers ...
 Math  I am in the 5th grade and my homework tonight is about complex numbers. I...
 Complex Numbers  The system of equations z  2  2i = \sqrt{23}, z  8  5i...
 math b  divide complex numbers: 2+33i^3/1i
More Related Questions