Answer:
4 • (x2y + 5y + 9)
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y
Step-by-step explanation:
i think this is the answer but i do not know
You would best do this by completing the square on the quadratic and subbing in the vertex they give you, like this:

Since the y coordinate of the vertex is 1/2 and we need to solve for c, set the

equal to 1/2 and solve for c, which is the whole point of what we are doing, right?

and


and c = 4. So that's our answer!