Question

If i =sqrt -1 and if x = 5 – 4i, then 1/x^2 -1=

Answer 1

is this
\[ \frac{1}{x^2 -1} \] ?

Answer 2

We have to find \(x^2\) first..

Answer 3

@rosebird don't keep yourself that busy. :P

Answer 4

yeh its the same as u write @phi

Answer 5

Yeah I am here only. :P

Answer 6

what is the solution?

Answer 7

\[x^2 -1 = (x-1)(x+1)\]

Answer 8

Place value of \(x\) there in the brackets.

Answer 9

solve it

Answer 10

What?

Answer 11

1/41-40i

Answer 12

Wait. :P

Answer 13

What?

Answer 14

ok

Answer 15

Give me some time to solve it. :P

Answer 16

ok

Answer 17

Nope.

Answer 18

Check it once again:
\[(4-4i)(6-4i) = ?\]

Answer 19

how?

Answer 20

How?

Answer 21

What is \((x-1)\) ??

Answer 22

oh ok

Answer 23

Getting?

Answer 24

yeh

Answer 25

So what it is:
\[(4-4i)(6-4i)\]

Answer 26

\(-40i\) is good, but check for \(41\).. :(

Answer 27

answer?

Answer 28

What?

Answer 29

you worry much for answers, we are half way, or less than that yet. :P

Answer 30

the options are
5-3i
4+i
1+5i/208
1-5i/208
@waterineyes

Answer 31

You said :
\[\frac{1}{41 - 40i}\]

I said, \(-40i\) is correct, but check for \(41\) again, how you got it?

Answer 32

You have two options:
1. Do whatever I am trying to say.
Or
2. Follow the first one..

Which one you like? :P

Answer 33

what are u saying

Answer 34

We have not reached answer yet, we will be there but we have time now to reach there?
Why you worry for answers?

Answer 35

then post ur answer and solution here i'll be back

Answer 36

Simply multiply it correctly:
\[(4-4i)(6-4i)\]

Answer 37

Sorry I can't do that. :)

Answer 38

after multiplying its 1/40-52i

Answer 39

Haven't you study our Code of Conduct yet?
If you have not then read this, click here:

\(\href{http:///openstudy.com/code-of-conduct}{\tt{Code \ Of \ Conduct.}}\)

Answer 40

@sirajawahid

Answer 41

Please do the calculations carefully.

Answer 42

you are multiplying it wrongly. :)

Answer 43

ok

Answer 44

Probably it is happening because you want to go with speed of light. :P

Answer 45

Calm down, do the calculations carefully, you have got all the time to learn. :)

Answer 46

@waterineyes, explain it to me please :)

Answer 47

From where? Till where you got it?