What is the equation of the axis of symmetry for the parabola y equals start fraction one over three end fraction left parenthesis x plus one right parenthesis squared minus three?

Y = (1/3)(x + 1)^2 -3
This is hk form of a parabola where hk is the vertex.
(-1,-3) is the vertex. The axis of symmetry is the vertical line that passes through the vertex of a parabola. The equation is x = -1

Aperecent is the answer