What is the axis of symmetry for the function f of x is equal to 7 minus 4 x plus x squared ?

Rewrite the function as x² − 4x + 7, so a = 1 and b = −4. The axis of symmetry is x = −b/(2a) = −(−4)/(2 × 1) = 2, which is choice D, x is equal to 2.

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