SOLUTION: g(x)=x2-6x-7 find the vertex

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Question 1004957: g(x)=x2-6x-7 find the vertex
Answer by josgarithmetic(39838) About Me  (Show Source):
You can put this solution on YOUR website!
The vertex has a value for x which is exactly in the middle of the zeros of the function.


Let D be the discriminant.
Zeros of x are %286%2B-+sqrt%28D%29%29%2F2.
Find the value of x in the middle.


%281%2F2%29%28%286-sqrt%28D%29%29%2F2%2B%286%2Bsqrt%28D%29%29%2F2%29

%281%2F2%29%281%2F2%29%286-sqrt%28D%29%2B6%2Bsqrt%28D%29%29

%281%2F4%2912

highlight%283%29--------the x value for the vertex.


Now, knowing that, what is g(3)?
Vertex point will be (3,g(3)).