book Maths Puzzle Numerical Ability

Find the vertex of the graph of the equation y=5+16x-2x^2. Show the algebraic steps used to solve this problem.

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i am not quite sure if this is in the right cat. so i apologize ahead of time if it is not...
i have been havin alot of trouble with this problem....so any help would be appreciat how do you work out the table of value for this question y=x�-2x-5