Solve the Problem $x$ Feet Wide, Express the Area of the Garden as a Garden

Multiple Choice

Solve the problem.
-Bob wants to fence in a rectangular garden in his yard. He has 64 feet of fencing to work with and wants to use it all. If the garden is to be $x$ feet wide, express the area of the garden as a function of $x$ .

A) $\mathrm { A } ( \mathrm { x } ) = 33 \mathrm { x } - \mathrm { x } ^ { 2 }$
B) $A ( x ) = 31 x - x ^ { 2 }$
C) $A ( x ) = 34 x ^ { 2 } - x$
D) $A ( x ) = 32 x - x ^ { 2 }$