How many times does the graph of y=X^2-1 cross the x axis?

Question

A.3

B.2

C.1

D.0

Answer 1

x^2-1 =(x-1)(x+1)

set each factor = 0 to solve for the x intercepts

the graph crosses the x axis twice, at x=-1 and at x=+1

B is the correct answer