If k^2 = t^2, which of the following must be true?
Choose the correct choice from the following.
A) |k| = |t| B) k = -m C) k = |m| D) k = -|m| E) k = m
Solution:   We are given that k^2 = t^2, and we can start by simplifying the equation by taking the square root of both sides.   √k^2 = √t^2   When we take the square root of a variable squared, the result is the absolute value of that variable. Thus:   √k^2 = √t^2 is |k| = |t|   Note that answer choices A through D could all be true, but each of them would be true only under specific circumstances. Answer choice E is the only one that is universally true.   |k| = |t|nswer: |k| = |t|
<result>A</result>
If k^2 = t^2, which of the following must be true?