Homework Help: math

Posted by Preston on Wednesday, January 24, 2007 at 6:38pm.

If two sides of a square field were incresed by three feet the area of the field would increase by 129 square feet. find the area of the original field.

If two sides of a square field were incresed by three feet the area of the field would increase by 129 square feet. find the area of the original field.

Let x be the side of the original square field.

Then, (x + 3)^2 - x^2 = 129

x^2 + 6x + 9 - x^2 = 129

6x = 120 making x = 20.

Therefore, the area of the original square is 20^2 == 400 sq. ft.

No one has answered this question yet.

Answer this Question

Related Questions

Math - Julie is digging a square area in her backyard for a vegetable garden. If...
Math - A football field, including the end zones, is 360 feet long and 160 feet ...
7th grade math help square roots - 4. Wei-Min makes a square quilt that has an ...
geometry - A rectangular field is 64 m X 25 m. Shawn wants to fence a square ...
math word problem - While finding the amount of seed needed to plant his three ...
math - The area of a rectangular field is 12,750 square yards. The width is 150 ...
math - How do you get square feet from inches? Ex: a room measures 179 inches by...
PreCalculus - Three sides of a fence and an existing wall form a rectangular ...
math - I don't understand this question so if you don't mind will you ...
math - a house has two rooms of equal area. one room is square and the other ...

For Further Reading

First Name:
School Subject:
Answer: