What is the axis of symmetry of h(x) = –2x2 + 12x – 3?

For a quadratic h(x) = ax² + bx + c, the axis of symmetry is x = −b/(2a). Here a = −2 and b = 12, so x = −12/[2(−2)] = 3. The axis of symmetry is x = 3, choice C.

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