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Absolute Value Equations

Start

Objectives

Absolute Value Inequalities

Summary

Absolute Value Function

Absolute Value Equations

Story

Story

Absolute Value Equations

Absolute value measures the distance of a number from zero on the number line.

|-3| = 3

|3| = 3

Example 1:

x = 5 or x = -1

x = 5 or x = -5

It translates to:

|x - 2| = 3

Absolute value equations often take the form |x| = a, where a≥0.

|x| = 5

x=5;-5

x=5;-1

Example 2: Solve

Example 1: Solve

Absolute Value as a Function

x<0

x≥0

is any - number.

is any + number or 0.

Here:

Definition: The absolute value of a number x is denoted as |x|.Mathematically:

Absolute Value is a Function with Two cases.

The absolute value function can be visualized as a "V" shape on a graph.

Plot f(x) = |x|

Absolute Value Inequalities

On a number line:

Equivalently:

|x| < a

-x < a and x < a

Means:

Inequalities can also involve absolute values in the form |x| < a (with a>0)

-a<x<a

-2<x - 3<2

|x - 3| < 2

Step 1

Step 2

Step 3

1 < x < 5

Example 1: Find the solution interval of

Let's see some examples:

On a number line:

Equivalently:

|x| > a

-x > a or x > a

Means:

For the cases |x| > a, the solution interval is disjoint (made up of two intervals).

x < -aor x > a

Click here to draw >

The solution will appear in 30 seconds

  • |x|<10 -> -10<x<10
  • |x-1|=5 -> x=6 or x=-4
  • |x+1|<5 -> -6<x<4
  • |x|>2 -> -2<x or x>2

-6<x<4

-2<x or x>2

-10<x<10

x=6 or x=-4

|x|>2

|x+1|<5

|x-1|=5

|x|<10

Select the solutions of each equation/inequality

Try it by yourself:

SUMMARY: Absolute value

Definition

Equations

Inequalities

|x|

Cases

Graph

Mathematical Def.

9TH-ABSOLUTE-VALUE-EQUATIONS-EN © 2024 by CASURID is licensed under CC BY-NC-ND 4.0

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Enlace

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El contenido visual es un lenguaje transversal, universal, como la música. Somos capaces de entender imágenes de hace millones de años, incluso de otras culturas. No nos gusta aburrir. No queremos ser repetitivos. Comunicar como siempre aburre y no engancha. Lo hacemos diferente. Hacemos sabotaje al aburrimiento. Creamos lo que al cerebro le gusta consumir porque le estimula.

MA.912.AR.4: Write, solve and graph absolute value equations, functions and inequalities in one and two variables. MA.912.AR.4.1 Given a mathematical or real-world context, write and solve one-variable absolute value equations. MA.912.AR.4.2 Given a mathematical or real-world context, write and solve one-variable absolute value inequalities. Represent solutions algebraically or graphically.

Enlace

un título genial aquí

El contenido visual es un lenguaje transversal, universal, como la música. Somos capaces de entender imágenes de hace millones de años, incluso de otras culturas. No nos gusta aburrir. No queremos ser repetitivos. Comunicar como siempre aburre y no engancha. Lo hacemos diferente. Hacemos sabotaje al aburrimiento. Creamos lo que al cerebro le gusta consumir porque le estimula.

Enlace

un título genial aquí

El contenido visual es un lenguaje transversal, universal, como la música. Somos capaces de entender imágenes de hace millones de años, incluso de otras culturas. No nos gusta aburrir. No queremos ser repetitivos. Comunicar como siempre aburre y no engancha. Lo hacemos diferente. Hacemos sabotaje al aburrimiento. Creamos lo que al cerebro le gusta consumir porque le estimula.

  • Grid paper.
  • Pencils of different colors.
  • Eraser.
  • A rule.
  • A calculator.
  • Geogebra installed on your phone/tablet/computer (or use online version).
MATERIAL

It is highly advised to have: