SOLUTION: A rectangle has a perimeter of 10 ft. Find a function that models its area A in terms of the length x of one of its sides.

Question 802102: A rectangle has a perimeter of 10 ft. Find a function that models its area A in terms of the length x of one of its sides.
Answer by josgarithmetic(39617) (Show Source): You can put this solution on YOUR website!
What do you know about a rectangle?
For yours, x and y are the side lengths,
, , elaborating on this notation, .

Solve the perimeter equation for y and substitute into A(x).

Now substitute:

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