Step 1 :
Given focus is (6, 0)
Equation of directrix is x = -6
Since the focus lies on the positive side of x - axis.
The axis of the parabola is x - axis.
Hence the equation of the parabola is
Substituting for $a$ we get,
$y^2=4 \times 6 \times x $
$ \Rightarrow y^2=24x$ is the equation of the parabola.