A 10-m by 7-m pond has a flower bed of uniform width surrounding it. If the total area is 180 square meters, what is the width of the border?
Original Area is 10 by 7
But new area, with the border is (10+2x)(7+2x).
So we need to solve the quadratic equation (10+2x)(7+2x)=180.
This ends up being factorable !