What are the coordinates of the vertex for f(x) = x² - 4x – 7. what formula do you use to find the x coordinate of the vertex?

X position is h = -b / 2*a

h = - -4 / 2 * 1

h = 2

k (or y) = ah^2 + bh + c

= 1 *4 + -4*2 * 2 -7

= 4 -8 -7

= -11

So vertex = (2, -11)

Source: https://www.1728.org/quadr3.htm

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