answersLogoWhite

0

Whether the graph has 0, 1 or 2 points at which it crosses (touches) the x-axis.

User Avatar

Wiki User

14y ago

Still curious? Ask our experts.

Chat with our AI personalities

BlakeBlake
As your older brother, I've been where you are—maybe not exactly, but close enough.
Chat with Blake
TaigaTaiga
Every great hero faces trials, and you—yes, YOU—are no exception!
Chat with Taiga
LaoLao
The path is yours to walk; I am only here to hold up a mirror.
Chat with Lao

Add your answer:

Earn +20 pts
Q: What does the discriminant tell you about the graph?
Write your answer...
Submit
Still have questions?
magnify glass
imp
Continue Learning about Other Math

How are the discriminant and the graph of a quadratic equation related?

If the discriminant = 0 then the graph touches the x axis at one point If the discriminant > 0 then the graph touches the x axis at two ponits If the discriminant < 0 then the graph does not meet the x axis


Given the function below what is the value of the discriminant and how many times does the graph of this function intersect or touch the x-axis?

Discriminant = 116; Graph crosses the x-axis two times


How do you tell if a discriminant is positive negative or zero?

With the standard notation, If b2 < 4ac then the discriminant is negative If b2 = 4ac then the discriminant is zero If b2 > 4ac then the discriminant is positive


Using the discriminant how many times does the graph of this equation cross the x axis 3x2 plus 6x plus 20?

In this case, the discriminant is less than zero and the graph of this parabola lies above the x-axis. It never crosses.


How do you find the discriminant on a graph?

The discriminant is the expression under the square root of the quadratic formula.For a quadratic equation: f(x) = ax2 + bx + c = 0, can be solved by the quadratic formula:x = (-b +- sqrt(b2 - 4ac)) / (2a).So if you graph y = f(x) = ax2 + bx + c, then the values of x that solve [ f(x)=0 ] will yield y = 0. The discriminant (b2 - 4ac) will tell you something about the graph.(b2 - 4ac) > 0 : The square root will be a real number and the root of the equation will be two distinct real numbers, so the graph will cross the x-axis at two different points.(b2 - 4ac) = 0 : The square root will be zero and the roots of the equation will be a real number double root, so the graph will touch the x-axis at only one points.(b2 - 4ac) < 0 : The square root will be imaginary, and the roots of the equation will be two complex numbers, so the graph will not touch the x-axis.So by looking at the graph, you can tell if the discriminant is positive, negative, or zero.