The area of a square is 40 in². If the length of each side of the square is 2x in., what is the value of x?

Answer 1

well, (2x)^2 = 40, right?
so, ...

Answer 2

Would you divide 40 by 2? Then, that would be 20. So, it is now x²=20. Would you then find the square root of 20?

Answer 3

no, (2x)^2 = (2x)(2x) = 4x^2, so
4x^2 = 40
x^2 = 10
x = √10

Answer 4

or, you could work it by doing this:

area is 40, so side is √40

2x = √40 = 2√10
so, x=√10