What is the axis of symmetry for the function f(x)=7−4x+x2?

For a quadratic f(x) = ax² + bx + c, the axis of symmetry is x = −b/(2a). Here a = 1 and b = −4, so x = −(−4)/(2 · 1) = 2. Therefore, the axis of symmetry is x = 2, choice C.

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