Question 176156
Please check your equation. 
You have it shown as a cubic(exponent 3) instead of quadratic (exponent 2).
Cubic functions do not have a vertex, that is a property of even exponent functions, such as quadratic equations.
Also, other two points? Please be more specific. 
{{{ graph( 300, 300, -5, 5, -10, 10,(x-3)^3-1) }}}