Consider the parabola given by the equation:
$\displaystyle {y}={x}^{{2}}+{8}{x}-{9}$

Find the following for this parabola:

A) Vertex: Written as an ordered pair.

B) Vertical Intercept: Written as an ordered pair.

C) Find the two values of $\displaystyle {x}$ that correspond to the $\displaystyle {x}$ intercepts of the parabola and write them as a list, separated by commas:
$\displaystyle {x}=$
Round your answer(s) to two decimal places.