# FAQ: What is the discriminant?

## How do I find the discriminant?

The discriminant is the part under the square root in the quadratic formula, b²-4ac. If it is more than 0, the equation has two real solutions. If it’s less than 0, there are no solutions.

## What is the discriminant of an equation?

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.

## What the discriminant means?

The discriminant is the term underneath the square root in the quadratic formula and tells us the number of solutions to a quadratic equation. If the discriminant is positive, we know that we have 2 solutions. If it is negative, there are no solutions and if the discriminant is equal to zero, we have one solution.

## What is the discriminant in math definition?

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.

## Why is getting 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).

## What does it mean if the discriminant is less than 0?

If the discriminant of a quadratic function is less than zero, that function has no real roots, and the parabola it represents does not intersect the x-axis.

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## Why is it called the discriminant?

The argument (that is, the contents) of the square root, being the expression b2 – 4ac, is called the “discriminant ” because, by using its value, you can “discriminate” between (that is, be able to tell the difference between) the various solution types.

## Can a quadratic equation have one real and one imaginary solution?

Answer Expert Verified A quadratic equation cannot have one imaginary solution because of the discriminant enclosed in a radical. The discriminant, √(b² – 4ac), determines the nature of the roots and it can only be either 2 real roots, 1 real solution or 2 imaginary roots.

## How do you tell if the discriminant is positive on a graph?

The roots/zeros/solutions are the the values for x that make the equation equal to 0. On a graph, this will be where the parabola crosses the x-axis. Anytime the discriminant is positive, the graph will cross the x-axis twice. The discriminant won’t tell you the actual answers.

## What happens when B 2 4ac 0?

If ( b2 – 4ac ) > 0.0, two real roots exist (i.e, the equation crosses the x-axis in two places — the x-intercepts). root of a negative number). If ( b2 – 4ac ) = 0, then only one real root exists — where the parabola touches the x-axis at a single point.

## What does it mean if the discriminant is a perfect square?

If the discriminant is a perfect square, then the solutions to the equation are not only real, but also rational. If the discriminant is positive but not a perfect square, then the solutions to the equation are real but irrational.

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## What is the nature of the roots if the discriminant is 0?

When discriminant is greater than zero, the roots are unequal and real. When discriminant is equal to zero, the roots are equal and real. When discriminant is less than zero, the roots are imaginary.

## How can you use discriminant in real life situation?

Using Discriminants In Real Life You want to hang your food pack from a branch 20 feet from the ground. You will attach a rope to a stick and throw it over the branch. a. Your friend can throw the stick upward with an initial velocity of 29 feet per second from an initial height of 6 feet.

## Which is a quadratic equation?

A quadratic equation is an equation of the second degree, meaning it contains at least one term that is squared. The standard form is ax² + bx + c = 0 with a, b, and c being constants, or numerical coefficients, and x is an unknown variable.

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