Answer:
C
y = x² - 4x - 5
Step-by-step explanation:
looking at the graph it crosses the x axis at 5 and -1
using the zero product property in reverse we can find the equation
subtract the roots from x and set equal to zero
(x-a) (x-b) =0 where a and b are the roots of the quadratic
(x-5) (x--1) = 0
(x-5) (x+1) =0
Foil
first x*x=x^2
outer : x*1=1x
inner: -5*x=-5x
last : -5*1=-5
add these together
x^2 +x-5x-5=0
x^2 -4x-5 =0
now set this equal to y to find points outside the x axis
y = x^2 -4x-5
