Find the vertex of the parabola

Question

y = f(x)= x^2 + 8 x - 11

x coordinate =
y coordinate =
Graph this function and estimate the x intercepts to the nearest tenth. Give your answers in order.
x intercept one =
x intercept two =

Answer 1

Y = x^2 + 8x - 11

h = Xv = -B/2A = -8/2 = -4.

k = Yv = (-4)^2 + 8*(-4) - 11 = -27

V(h, k) = (-4,-27)

Use the following points for graphing:

(x, y).
(-10,9)
(-7,-18)
(-6,-23)
(-5,-26)
V(-4,-27)
(-3,-26)
(-2,-23)
(-1,-18)
(2,9).

X-intercepts:
X1 will be negative.
X2 will be positive.