If k^2 = m^2, which of the following

Jeffrey Braganza

Since the Q states K^2 = M^2
Means (5)^2 = (-5)^2 or (-5)^2 = (5)^2
K can be +ve or -ve
M can be +ve or -ve
[Every number has two square roots: positive and negative]

Now that we know what K & M should be: looking at answer choices (process of elimination)
A: K = +M
But K can be -ve too. Incorrect

B: K = -M
Again K can be +ve, Incorrect

C & D Incorrect for the same reason as A & B

E: |k| = |m|
Irrespective if K & M is +ve or -ve, taking the modulus will render only positive values. Hence E is the right answer
{Not sure if this is the right way to solve this}

Dec 31, 2015 • Comment