Answer
False.
It represents a hyperbola.
Work Step by Step
Standard form of a circle with center at the origin:
$x^2+y^2=r^2$, in which $r$ is the radius.
Standard form of a hyperbola with center at the origin and horizontal transverse axis:
$\frac{x^2}{a^2}-\frac{y^2}{b^2}=1~~$ It can be written as:
$x^2-\frac{a^2}{b^2}y^2=a^2$
This last form is the form of the given equation, in which $a=b=12$.
