Posted by jane on Thursday, November 10, 2011 at 10:56am.
Please help:
If the sides of a square are lingthened by 7cm, the area becomes 169cm^2. Fine thelength of a side of the orginal square.

algebra  Steve, Thursday, November 10, 2011 at 11:14am
If the original side is s,
(s+7)^2 = 169 = 13^2
s+7 = 13
s = 6
s = 20 also satisfies the original equation, but does not fit the real world.