Question

inik, please help me, having trouble with the complex numbers solution you gave me:
[(1 + i)(4 − i) − 3∗i] / (i∗(4 − i) ) = (4 + 4i − i + 1 − 3i) / (4i + 1) = 5 / (4i + 1)
= 5 / (4i+1)

Answer 1

(4 - i +4i-(i^2) )/(4-i+4i- (i^2))=(4+4i-i+1)/(3i+5)=(3i+5)/(4i+1)
this is based on what I wrote...
got different answer!
or made a mistake when I copied long expression or got wrong answer preciously :(
what was the original problem - please remind me

Answer 2

\[\frac{(1+i)(4-i)-3i}{i(4-i)}\]?

Answer 3

Original problem: [(1+ i) / i] + [-3 / (4-i)]

Answer 4

\[\frac{5+3i-3i}{1+4i}\]
\[\frac{5}{4+i}\]

Answer 5

oh.

Answer 6

based on satellite73...:
my first answer is right!
3i & 3i are canceled out :)

Answer 7

satellite73.. it should be:
5/(4i+1)
right?

Answer 8

\[\frac{1+i}{i}=1-i\]
\[\frac{-3}{4+i}=-
\frac{12}{17}-\frac{3}{17}i\]

Answer 9

So I solve them both seperately?

Answer 10

i guess i am confused as to which problem you are doing. if it is
\[\frac{1+i}{i}-\frac{3}{4-i}\] then i get something completely different.

Answer 11

Completely different from inik, you mean?

Answer 12

i would compute each one, put in standard form and then subtract. that is all

Answer 13

it depends on the problem you are going. the one i wrote above is not what you have up top.

Answer 14

Then I'm very sorry for the mixup, because that it the problem.

Answer 15

I tried to write it out like it should have been.

Answer 16

ooooooooooooh i isee what you are doing. you are using
\[\frac{a}{b}-\frac{c}{d}=\frac{ad-bc}{bc}\]

Answer 17

maybe lnik is right.

Answer 18

i would just compute each one and then add or subtract real from real and complex from complex

Answer 19

And inik used a common denominator, right?

Answer 20

inink and satellite when you get done and if you have time and if you like i'm having trouble with this one question
i will come back and give a link k?

Answer 21

if the problem is
\[\frac{1+i}{i}-\frac{3}{4-i}\] then i get
\[1-i-\frac{12}{17}-\frac{3}{17}i\]
\[=\frac{5}{17}-\frac{20}{17}i\]

Answer 22

where you at?

Answer 23

http://openstudy.com/groups/mathematics#/groups/mathematics/updates/4e2862ba0b8b3d38d3b8e738

Answer 24

inik, did you get something like that?

Answer 25

i got what satellite got

Answer 26

Okay, thank you as well.