For x=4 the functiom f(x) =x2+bx+c has the minimum value of_9.find c

Step-by-step explanation:

Vertex of a quadratic function:

Suppose we have a quadratic function in the following format:

It's vertex is the point

In which

Where

If a>0, the vertex is a minumum point, that is, the minimum value happens at , and it's value is .

In this question:

Minimum value at means that . So

So

Minimum value of 9:

So

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step-by-step explanation:

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step-by-step explanation:

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