What is the y-value of the vertex of the function f(x)=-(x-3)(x+11)?
0
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49

Step-by-step explanation:

The given function is .

We expand to get:

We complete the square to obtain the vertex form as follows:

This function is now of the form:

, where (h,k)=(-4,49) is the vertex.

The y-value of the vertex is therefore 49

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step-by-step explanation:

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