If the length of each side of a square is increased by 6, the area is multiplied by 16. Find the length of one side of the original square.
x = original
area = x * x = x^2
now add 6
(x+6)* (x+6) = 16 x^2
-15x^2 + 12x + 36 = 0 Quadratic Formula shows x = 2 units