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Axis of symmetry

Given the quadratic function y = 9 x 2 - 6 x + 3,

What is the equation of the axis of symmetry ? 1) x = 2/3 2) x = - 1/3
3) x = - 2/3 4) x = 1/3

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This solution is comprised of a detailed explanation to answer what is the equation of the axis of symmetry ? 1) x = 2/3 2) x = - 1/3 3) x = - 2/3 4) x = 1/3.

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