A Rectangle That Is X Feet Wide Is Inscribed In

A rectangle that is x feet wide is inscribed in a circle of radius 8 ft.
A rectangle that is x feet wide is inscribed in

(a) Express the area of the rectangle as a function of x.
(b) Find the domain of the function.
(c) Graph the function with a graphing calculator.
(d) What dimensions maximize the area of the rectangle?

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