Which of the following is the conjugate of a complex number with 5 as the real part and -2 as the imaginary part?
5 + 2i
-5 - 2i
-5 + 2i
5 - 2i

Question

Which of the following is the conjugate of a complex number with 5 as the real part and -2 as the imaginary part?
5 + 2i 
-5 - 2i 
-5 + 2i 
5 - 2i

undeadknight26 · Answer

I think its either A or C...

unklerhaukus · Answer

conjugate means the sign of the imaginary part changes

undeadknight26 · Answer

Ohhh so it would be subtraction?

xapproachesinfinity · Answer

kind of :)
let a+bi be a complex number
the conjugate of this number would be a-bi

undeadknight26 · Answer

So it would be D...I think i understand...

xapproachesinfinity · Answer

yesh :)
what is the conjugate of $\sqrt{3}i-2$

undeadknight26 · Answer

umm 2 + sqrt3i?

xapproachesinfinity · Answer

not quite 
it should be -2-sqrt3i hehehe

undeadknight26 · Answer

O.O

xapproachesinfinity · Answer

remember we said a+bi the conjugate is a-bi
i didn't change the sign for a the real part i changed the sign for the imaginary part
that's why it is -2-sqrt3i

undeadknight26 · Answer

Ohhhhhhhh...I think i get it O.O

xapproachesinfinity · Answer

yes^_^

xapproachesinfinity · Answer

first to not be confused rewrite the number like this
-2+sqrt3i then do the conjugate -2-sqrt3i