Question

what is the conjugate of 10 - 5i ?

A. 5-10i
B. 10+5i
C. -10-5i
D. -10+5i

Answer 1

We will call the conjugate od a complex number, to the simmetric vector, obtained by drawing a imaginary line parallel to the real axis.
So, let's say we have a complex number, composed by two variables:
\[a+bi\]
The only way I will attain such symmetry is by changing the imaginary component to the opposite (I will not say negative, because we're talking about vectors).
So, the conjugate is then:
\[a-bi\]
I enlighted the room to the solution, now step foward by applying it to the problem.

Answer 2

\(\Large\bf \color{#8C3D62 }{\text{Welcome to OpenStudy! :)}}\)

Answer 3

thanks a bunchhh!

Answer 4

Openstudy is where you can cheat without getting caught :DDD