The domain for f(x) and g(x) is the set of all real numbers. Let f(x) = x2 + 1 and g(x) = 3x.

Find f · g.

A.
x2 + 3x + 1

B.
3x3 + 3x

C.
3x3 + 3x + 1

D.
x2 + 3x

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