Book Maths Puzzle Co-ordinate geometry

Where is the vertex of the graph of y=x^2-5. (resubmitted the first person that answered this didn't give the answer)

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Book Other Question

Using the quadratic formula for x in the equation 2x^2=11x-9 results in which of the following values:
Option
A. -9/2 or 1
B. 9/2 or -1
C. 9/2 or 1
D. -9/2 or -1

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