the x-intercept is the such that . so...
so the x-intercept of this function is .
What's the definition of a critical value? I'm not familiar with that term.
A critical value would be a value where the first derivative of the function is 0 or where the function does not exist.
So the function does not exist at x = 0, so this is a critical point.
So when this is 0 we have a critical point:
So this is your other critical point.
-Dan