SOLUTION: the old lion cage at the zoo was a square, with sides x meters long. For part of the zoo's 50th b-day celebration, the zoo expanded the length and width of the cage. The expression

Question 71906: the old lion cage at the zoo was a square, with sides x meters long. For part of the zoo's 50th b-day celebration, the zoo expanded the length and width of the cage. The expression for total area of the new cage is (x^2 + 18x + 81). square meters.
How much did the zoo expand the length and width of the cage?
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
let's say the increase to each side is a meters
Then the expression for the area is

from this you can see that
and

satisfies both of these, so
the length and width was increased by 9 meters
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