Question

Where does the graph of

y = x^2 - x - 20 cross the x-axis?

(-5,0) and (4,0)
(4,0) and (5,0)
(2,0) and (-10,0)
(5,0) and (-4,0)

Answer 1

D

Explanation:

"Cross the x-axis" means that y =0

0=x²-x-20

(x-5)(x+4)=0

x=5, x= - 4

Points (5,0) and (-4,0)