Which of the following expressions is the conjugate of a complex number with −5 as the real part and 4i as the imaginary part?

Question

anonymous · Answer

5 + 4i

 5 − 4i

 −5 − 4i

 −5 + 4i

anonymous · Answer

arggghhhh

primeralph · Answer

Why? Seriously, why?

anonymous · Answer

your complex number is $-5+4i$ and the conjugate of $a+bi$ is $a-bi$ making the conjugate of $-5+4i$ as $-5-4i$

anonymous · Answer

@primeralph what is wrong with this problem?

anonymous · Answer

or rather i should say "what incompetent wrote this problem?"

primeralph · Answer

@satellite73  If 4i is the imaginary part, then the complex number is real = -5+-4.

anonymous · Answer

btw as usual the answer is C, because it is always C

anonymous · Answer

really?  what is the imaginary part of $2+3i$ ?

primeralph · Answer

Im(2+3i) = 3.  It's the coefficient.

anonymous · Answer

exactly
so what moron wrote "and 4i as the imaginary part"

primeralph · Answer

@satellite73  Take it easy on them.

anonymous · Answer

i don't mean the person who asked this question, i assume she did not write it
some math teacher wrote it