Which quadratic is best solved by taking the square root?

x^2 - 9 = 0

Step-by-step explanation:

it is best to use square root method when there is no b value. in this equation, there is no b, only an a and c

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.

70

step-by-step explanation:

2*5=10

4*15=60

60+10=

70