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Example function.

Y = X2 - 4X + 5

set to 0

X2 - 4X + 5 = 0

X2 - 4X = - 5

Now, halve the linear coefficient, square it and add it to both sides

X2 - 4X + 4 = - 5 + 4

gather terms on the right and factor on the left

(X - 2)2 = -1

==============Vertex form.

(2, - 1)

=======Vertex.

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Q: How do you calculate the vertex on a function graph?
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