Explain how you can locate the vertex, V, of the parabola with the given focus and directrix. Write the coordinates of the verte
2 answers:
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Part A is accomplished by first factoring out the b^2 to get
. Factor that completely using the quadratic formula to get 
. Part B is done entirely with the quadratic formula (only cuz that's the easiest way to factor a second degree polynomial!) to get (x-9)(x-9) or (x-9) multiplicity 2. Part C is done by taking roots. Keep in mind that since this is a second degree polynomial you will have 2 solutions. 
, therefore, 
and 
which is +11 and -11. And you're done! Factoring is very important...make sure you learn it and learn it well!!!