How do you find the y coordinate of the vertex of a parabola?

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The y-coordinate of the vertex of a parabola in ##y=ax^2 + bx + c## is ##k = (4ac - b^2)/(4a)##

explanation: The vertex of a parabola, written in ##y= ax^2 + bx + c## , denoted by the ordered two ( h, k ) in which h is the x-coordinate and k is the y-coordinate is obtained using the formulas below:

##h = -(b)/(2a)##

##k = (4ac - b^2)/(4a)##

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