Answer:
Option 3rd is correct
x= -4
Step-by-step explanation:
A quadratic equation
.....[1];
then the axis of symmetry is given by:
....[2]
As per the statement:
Given the equation: 
On comparing with [1] we have;
a = 3, b = 24
Substitute in [2] we have;

Therefore, the line of symmetry for the parabola is, x = -4