What is the axis of symmetry for the graph of y – 4x = 7 – x2 ?

Rewrite the equation as y = −x² + 4x + 7. For a parabola y = ax² + bx + c, the axis of symmetry is x = −b/(2a); here a = −1 and b = 4, so x = −4/(2 × −1) = 2. The axis is x = 2, choice A.

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