The graph of which function has an axis of symmetry at x is equal to negative 1 fourth ?

For a quadratic function f(x) = ax² + bx + c, the axis of symmetry is x = −b/(2a). In choice A, a = 2 and b = 1, so the axis is x = −1/(2 × 2) = −1/4. Therefore, the function 2x² + x − 1 has the stated axis of symmetry.

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