Subtracting Polynomial Functions

If f(x) = x3 - x2 + 2x + 4 and g(x) = 5x + 7, what is g(x) - f(x)?

-x3 + x2 + 3x + 3

x3 - x2 - 3x - 3

-x3 - x2 - 3x + 11

x3 + x2 - 3x - 3

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