SOLUTION: one of the sides of a rectangle is 3 meters shorter than the other one. Find the side of the rectangle if we know that if we increase every side with one meter the surface of the r

Question 981528: one of the sides of a rectangle is 3 meters shorter than the other one. Find the side of the rectangle if we know that if we increase every side with one meter the surface of the rectangle will be increased with an 18m^2.
Answer by josgarithmetic(39617) (Show Source): You can put this solution on YOUR website!
x and y the side lengths.
x=y-3, as described.
Initial area, xy.

Next part of description,

substitute for x from the description,

and then
.
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