Question

Create a graph; then answer the following question.

What are the key points on the graph of y=x2−8x
? Name the vertex, x-intercept(s), and y-intercept.

(1 point)

x-intercept: (0,8)


y-intercept: (0,0)


vertex: (4,−16)



x-intercepts: (0,0)
(0,8)


vertex: (4,−16)


There is no y-intercept.


x-intercepts: (0,0)
(8,0)


y-intercept: (0,0)


vertex: (4,−16)



x-intercept: (4,−16)


y-intercept: (0,0)


vertex: (8,0)


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Answer 1

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

(Thus the correct choice is the one listing x-intercepts (0,0) and (8,0), y-intercept (0,0), vertex (4,−16).)