## Introductory Algebra for College Students (7th Edition)

$$x = 4$$
To find which numbers the rational expression will be undefined, we set the denominator equal to zero and then solve: $$6x - 24 = 0$$ Add $24$ to both sides to isolate the variable to one side of the equation: $$6x = 24$$ Divide by $6$ to solve for $x$: $$x = 4$$