It depends on the vertex of what!
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The x-intercept of an equation is any location where on the equation where x=0. In the case of a parabolic function, the easiest way to obtain the x intercept is to change the equation into binomial form (x+a)(x-b) form. Then by setting each of those binomials equal to zero, you can determine the x-intercepts.
X intercept = -4 Y intercept = 2
The x intercept would be 14 and the y intercept would be 6.
Then there is no x-intercept. No big deal. Lots of functions do not have x- intercepts. For example, y = x2 + 1 or y = 2x
The equation 9=3y has the x-intercept (0,0) and the y-intercept (0,3).