If |z|/w = 5,which of the following must be true?
Answers:
A) z = -5w  B) z = 5w  C) z^2 = 25w^2  D) z^2 = 25w^3  E) z^3 = 125w^3
|z|/w = 5.   |z| = 5w.   Then z = 5w or -5w and so z^2 = 25w^2.   The answer is z^2 = 25w^2.
<result>C</result>
If |z|/w = 5,which of the following must be true?