Question

If $k^2=m^2$ which of the following must be true?

• A. k=m
• B. k=-m
• C. $k=\left|m\right|$
• D. $k=-\left|m\right|$
• E. $\left|k\right|=\left|m\right|$

Answer 1

Answer: (E)

$\left|k\right|=\left|m\right|$

k${}^2$= m${}^2$ implies k = +m or k= -m

Thus |k| = |m| (option E)