Question

The function whose graph is shown is


A)
f(x) = x2 - 5


B)
f(x) = x2 - 9


C)
f(x) = x2 - 4x - 5


D)
f(x) = x2 - 4x - 9

Answer 1

http://usatestprep.com/modules/gallery/files/18/1830/1830.jpg

Answer 2

For a graph with vertex (a,b), the graph is y=(x-a)^2+b

Answer 3

what formula is that? I dont remember learning that in algebra 1...

Answer 4

just plug in a = 2, b = -9 into that formula
and rearrange to get one of the options