Given that the equation [tex]z^2+(p+iq)z+r+is=0,[/tex] where

[juantheron]

Given that the equation z^2+(p+iq)z+r+is=0, where p,q,r,s are real and non-zero root then
which one is right
1. pqr=r^2+p^2s

2. prs=q^2+r^2p

3. qrs=p^2+s^2q

4. pqs=s^2+q^2r

 

[SammyS]

What have you tried?

Where are you stuck?

To start, let z = x + y i , where x & y are real.

I assume i ² = -1

 

[juantheron]

put z=x+iy(x+iy)^2+(p+iq)(x+iy)+r+is=0 x^2-y^2+2ixy+px-qy+i(qx+py)+r+is=0\left(x^2-y^2+px-qy+r\right)+i\left(qx+py+2xy+s\right)=0+i.0\left(x^2-y^2+px-qy+r\right)=0\left(qx+py+2xy+s\right) = 0

Now I am struck here.

 

[SammyS]

Given that the equation z^2+(p+iq)z+r+is=0, where p,q,r,s are real and non-zero root then
which one is right
...

Sorry for my lame suggestion !

Use the quadratic formula to solve for z, then the part of the instructions which seem to be missing some words; in bold below.

... p,q,r,s are real and non-zero root ...