Aus Online Mathematik Brückenkurs 1
A point lies on the
x
-axis if it has
y
-coordinate
0
and we therefore look for all the points on the curve
y=x2−1
where
y=0, i.e. all points which satisfy the equation
0=x2−1
This equation has solutions
x=
1, which means that the points of intersection are
−1
0
and
10 .
