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

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.
x2 + 3x
C.
3×3 + 3x + 1
D.
x2 − 3x + 1

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