math
posted by Preston .
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.
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