Answer:
x = - 3
Step-by-step explanation:
The axis of symmetry is a vertical line passing through the vertex of the parabola with equation
x = c
where c is the value of the x- coordinates the line passes through
The line passes through (- 3, - 6), (- 3, 4 ) with x- coordinates - 3
Then equation of axis of symmetry is x = - 3
