# 4.6: Quadratic Formula and Complex Sums

Difficulty Level:

**At Grade**Created by: CK-12Estimated10 minsto complete

%

Progress

**Practice**Quadratic Formula and Complex Sums

MEMORY METER

This indicates how strong in your memory this concept is

Practice

Progress

Estimated10 minsto complete

%

Estimated10 minsto complete

%

Practice Now

MEMORY METER

This indicates how strong in your memory this concept is

Turn In

### Notes/Highlights Having trouble? Report an issue.

Color | Highlighted Text | Notes | |
---|---|---|---|

Show More |

complex number

A complex number is the sum of a real number and an imaginary number, written in the form .complex root

A complex root is a complex number that, when used as an input () value of a function, results in an output () value of zero.discriminant

The discriminant is the part of the quadratic formula under the radical, . A positive discriminant suggests two real roots to the quadratic equation, a zero suggests one real root with multiplicity two, and a negative indicates two complex roots.Imaginary Numbers

An imaginary number is a number that can be written as the product of a real number and .Quadratic Formula

The quadratic formula states that for any quadratic equation in the form , .Real Number

A real number is a number that can be plotted on a number line. Real numbers include all rational and irrational numbers.### Image Attributions

Show
Hide
Details

Description

Identifying complex roots of quadratic functions with the quadratic formula, and adding and subtracting complex numbers.

Learning Objectives

None

Related Materials

Difficulty Level:

At Grade
Tags:

Subjects:

## Concept Nodes:

Date Created:

Nov 01, 2012
Last Modified:

Mar 23, 2016
Vocabulary

None

Files can only be attached to the latest version of Modality