What is this?

x^2 + 4·x - 12 = (x - 2)·(x + 6)

x^2 + 4·x - 12 = (x + 2)^2 + 8

c. prove the lengths are the same.

step-by-step explanation:

you need to prove the segments are congruent. congruent segments have the same length. find the lengths of the segments using the distance formula, and compare them.

answer: c. prove the lengths are the same.