SOLUTION: Totally confused. Please help If the sides of a square are lengthened by 7cm, the are becomes 225cm^2. Find the length of a side of the original square. Yje length of a side

Algebra ->  Quadratic Equations and Parabolas -> SOLUTION: Totally confused. Please help If the sides of a square are lengthened by 7cm, the are becomes 225cm^2. Find the length of a side of the original square. Yje length of a side       Log On


   

Question 132153: Totally confused. Please help
If the sides of a square are lengthened by 7cm, the are becomes 225cm^2. Find the length of a side of the original square.
Yje length of a side of the original square is ____cm.
Answer by rapaljer(4671) About Me  (Show Source):
You can put this solution on YOUR website!
%28x%2B7%29%5E2=225

Take the square root of each side:
x%2B7=15 or x%2B7=-15

Reject the second case, since the side of a square must be positive!
x=8 cm

R^2