Multiple Choice: If a quadratic equation has exactly one real root, what must be true of its graph?

PICK ONE


1) The graph of the function opens upward


2) The graph of the function opens downward


3) The graph of the function intersects the x-axis exactly once.


4) The graph of the function intersects the y-axis exactly once.Multiple Choice: If a quadratic equation has exactly one real root, what must be true of its graph?
it would be #3....being the one root is y=0....therefore the x axis is touched only once.Multiple Choice: If a quadratic equation has exactly one real root, what must be true of its graph?
And to clarify on Jimmy's answer, it must be a parabola opening up or down, with the vertex on the x-axis as the only point of intersection.
A root means that y is 0, therefore it touches the x axis.


If there is one root, then it touches the x axis exactly once.