# How do you describe discriminant roots?

## How do you describe discriminant roots?

The discriminant is defined as \(\Delta ={b}^{2}-4ac\). This is the expression under the square root in the quadratic formula. The discriminant determines the nature of the roots of a quadratic equation. The word ‘nature’ refers to the types of numbers the roots can be — namely real, rational, irrational or imaginary.

## What are X-intercepts roots?

If we graph the equation y=f(x) on a cartesian plane, then the x -intercepts are the points at which y=0 , meaning they occur exactly where f(x)=0 , i.e. where x is a root of the function.

What is the meaning of the discriminant?

Discriminant, in mathematics, a parameter of an object or system calculated as an aid to its classification or solution. In the case of a quadratic equation ax2 + bx + c = 0, the discriminant is b2 − 4ac; for a cubic equation x3 + ax2 + bx + c = 0, the discriminant is a2b2 + 18abc − 4b3 − 4a3c − 27c2.

### How do you know if roots are imaginary?

To determine the nature of roots of quadratic equations (in the form ax^2 + bx +c=0) , we need to caclulate the discriminant, which is b^2 – 4 a c. When discriminant is greater than zero, the roots are unequal and real. When discriminant is equal to zero, the roots are equal and real.

### What is a zero or root?

In mathematics, a zero (also sometimes called a root) of a real-, complex-, or generally vector-valued function , is a member of the domain of such that vanishes at ; that is, the function attains the value of 0 at , or equivalently, is the solution to the equation.

What is difference between roots and zeros?

A root of an equation is a value at which the equation is satisfied. Roots the equation f(x)= x3+ x2– 3x – ex=0 are the x values of the points A, B, C and D. At these points, the value of the function becomes zero; therefore, the roots are called zeroes.

#### What does the discriminant tell us about the X-intercepts?

If the value of the discriminant is positive, there are two real solutions for x, meaning the graph of the solution has two distinct x-intercepts. If the value of the discriminant is zero, there is one real solution for x, meaning the graph of the solution has one x-intercept.

#### How are the factors related to the X-intercepts?

Thus, there are our x-intercepts. By the way, for the future, along the x-axis, y = 0, so if you are asked for the x-intercepts (or roots), set y = 0 and solve for x. Along the y-axis, x = 0, so if you are asked for the y-intercepts, set x = 0 and solve for y.

What is the purpose of the discriminant?

The discriminant is the part of the quadratic formula underneath the square root symbol: b²-4ac. The discriminant tells us whether there are two solutions, one solution, or no solutions.

## Why is the discriminant important?

The quadratic equation discriminant is important because it tells us the number and type of solutions. This information is helpful because it serves as a double check when solving quadratic equations by any of the four methods (factoring, completing the square, using square roots, and using the quadratic formula).

## Which is the best definition of a discriminant?

Discriminants. The discriminant of an equation gives an idea of the number of roots and the nature of roots of the equation. In other words, it “discriminates” between the possible solutions. The discriminant is the expression found under the square root part of the quadratic formula (that is, .

When to use the discriminant formula in math?

If , there are two real solutions. If , there is one real solution. If , there are no real solutions, but there are two complex imaginary solutions. To find the solutions, manipulate the quadratic equation to standard form ( ), determine a, b, and c, and plug those values into the discriminant formula.