√-1
________
(2 - 4i) - (5 +3i)

Simplify the expression

Question

√-1
________
(2 - 4i) - (5 +3i)

Simplify the expression

radar · Answer

$$\sqrt{-1}\over (2-4i)(5+3i)$$Is the expression?

anonymous · Answer

yes it is

radar · Answer

Or is it$$\sqrt{-1}\over (2-4i) - (5+3i)$$

anonymous · Answer

yeah that is correct

radar · Answer

If it is the first$$7-11i \over 340$$If it is the second:$$-(3i+7)\over 58$$

anonymous · Answer

how did you get 58? I got 40

radar · Answer

I got 9-49i^2  or that would be 9 -(49)(-1)=9+49=58
but you got me worried let me recheck.

anonymous · Answer

lol ok

radar · Answer

(-3-7i)(-3+7i)=9 -49 i^2=9+49=58

anonymous · Answer

Oh ok, yeah I looked back at my work and I added wrong. so it would be 
-7 - 3i / 58

radar · Answer

don't forget$$i ^{2}=-1$$

anonymous · Answer

So wait.. is it -7 - 3i /58, because before I put i as -1, it was -3i + 7i^2

radar · Answer

I changed the two signs by placing the sign to the left and on the viniculum

radar · Answer

Yes,

-3i-7                   3i+7
-------     or    - -----
    58                      58

note the minus sign to the left (middle) of the 2nd term.

anonymous · Answer

Thank you very much :)

radar · Answer

u r welcome