SOLUTION: Barbie and Ken planned to build a square house that was x feet on each side. Then they revised the plan so that one side was lengthened by 20 feet and the other side was shortened

Question 288691: Barbie and Ken planned to build a square house that was x feet on each side. Then they revised the plan so that one side was lengthened by 20 feet and the other side was shortened by 6 feet. Find a polynomial function A(x) that gives the are of the revised house in square feet.
Answer by texttutoring(324) (Show Source): You can put this solution on YOUR website!
Originally, each side had a length of x.
After the changes, we now have length=l=x+20, and width=w=x-6
The area of a rectangle is just A=l*w

A=(x+20)(x-6)

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