Consider the parabola given by the equation: $f\left(x\right)=2x^2-10x-9$

Find the following for this parabola:

A) The vertex:    

B) The vertical intercept is the point    

C) Find the coordinates of the two $x$ intercepts of the parabola and write them as a list, separated by commas: 
   
It is OK to round your value(s) to to two decimal places.