The equation of a parabola in vertex form is given by \( y = a(x-h)^2 + k \), where \((h, k)\) is the vertex of the parabola.
In your equation, \( y = 3(x - 1)^2 - 12 \), we can see that:
- \( a = 3 \)
- \( h = 1 \)
- \( k = -12 \)
The axis of symmetry for a parabola in this form is given by the line \( x = h \).
Since \( h = 1 \) in your equation, the axis of symmetry is:
\[ x = 1 \]