Which function in vertex form is equivalent to f of x is equal to 4 plus x squared minus 2 x ?

Rearrange the expression as x² − 2x + 4. Completing the square gives x² − 2x + 1 + 3 = (x − 1)² + 3, so the equivalent vertex form is “f of x is equal to (x − 1) squared plus 3,” choice C.

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