A wire of length 9x is bent into a square. Express the are A of the square as a function of x

A wire of length 9x is bent into a square. Express the are A of the square as a function of x
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The wire represents the perimeter of the square. The perimeter is the total length of 4 sides, so divide 9x by 4 to get the length of one side, 9x/4. The area A of the square is the square of this side, A=81x^2/16.

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