Find the axis of symmetry of a quadratic function.
\( \text{Find the axis of symmetry for the quadratic function } y = 3x^2 + 12x + 5. \)
Choose one option:
Compute \(x = -b/(2a)\) to get the line of symmetry.
The axis of symmetry formula is \(x = -b/(2a)\) for \(y = ax^2 + bx + c\).
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