Question

Create a graph; then answer the following question.
What are the key points on the graph of y = x^2 - 8x? Name the vertex, x-intercepts), and y-
intercept.
(1 point)
x-intercepts: (0, 0) (8, 0)
• y-intercept: (0, 0) vertex: (4, - 16)
x-intercept: (0,8)
y-intercept: (0, 0) vertex: (4, - 16)
x-intercept: (4, - 16)
y-intercept: (0, 0)
vertex: (8,0)
x-intercepts: (0, 0) (0,8)
vertex: (4, - 16)
There is no y-intercept.

Answer 1

y = x^2 − 8x = x(x − 8), so the x-intercepts are (0, 0) and (8, 0).
Rewrite as y = (x − 4)^2 − 16, so the vertex is (4, −16).
The y-intercept (x = 0) is (0, 0).