Thomas is building rectangular boxes. The table shows the area in square feet, f (x), of the bottom of a box when one side of the box is x feet long.

x 1 2 3 4 5

f (x) 2 8 18 32 50

A f (x) = x^2+2x

B f (x) = x^2/2

C f (x) = 2x^2

D f (x) = 2x

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