Posted by jill on Sunday, January 2, 2011 at 4:44pm.
if the sides of a square are increased by 5 cm the area of the new square is four times the area of the original square. Find the length of a side of the original square.

math  PsyDAG, Monday, January 3, 2011 at 10:18am
Let x = side of square.
(x+5)^2 = 4x^2
Solve for x.