The formula for finding the area of a square that has a side length, s, is a = s2. if a square has an area of 40 square units, what is the length of a side? 2 10 20

2√10

Explanation:
The rule to get the area of the square is given as:
A = s^2
We are given that:
Area = 40 
Substitute with the given area to get the side (s) as follows:
A = s^2
40 = s^2
s = √40
either s = 2√10 unit length (accepted solution)
or s = -2√10 unit length (rejected solution because the length of the side cannot be negative)