Plz mee

question is in the picture

a. factoring
b. isolating the x^2 term and finding the square root of both sides
c. using the quadratic formula
d. all three methods would be efficient

When rates are expressed as a quantity of 1, such as 2 feet per second or 5 miles per hour, they are called unit rates. if you have a multiple-unit rate such as 120 students for every 3 buses, and want to find the single-unit rate, write a ratio equal to the multiple-unit rate with 1 as the second term.

The answer should be c.