Hello, I am having issues with an equation involving limits and I am suppose to find the Vertical Asymptote. I thought that this equation had no Vertical asymptotes but mathlab says there is a VA at x=4

f(x=)

factor

the (x-4) cancels and leaves

which leave a possible assymptote at x = 4,

but if i plug in 4 to the original equation

=

which is not really an assymptote, but a hole in the graph. What am I doing wrong?