SOLUTION: if (-2,7) is the maximum point for the graph of y=-2x^2-4bx+k FInd the value of k?

Question 815097: if (-2,7) is the maximum point for the graph of y=-2x^2-4bx+k FInd the value of k?
Answer by josgarithmetic(39613) (Show Source): You can put this solution on YOUR website!
Here is a start but not the full answer.

This is after completing the square and is now in standard form. The vertex is at and

You are essentially given that as a maximum, (-2,7) is the vertex, and now you will equate and ; and you clearly will find how to finish this.
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