Question

Where does the graph of x2 - x - 2 = y cross the x-axis?

A) (2, 0) and (-1, 0)
B) (0, 2) and (0, -1)
C) (1, 2) and (2, -1)
D) (-2, 0) and (-1, 0)

Answer 1

It crosses the x axis when y = 0.
so we need to solve x^2 - x - 2 = 0.
This is done as follows:
x^2-x-2=0
(x-2)(x+1) = 0
Therefore x = 2 or x = -1.

So the two coordinates are (2,0) and (-1,0) the answer is A