
WEEK 17-ABSOLUTE-VALUE-EQUATIONSWEEK 17-ABSOLUTE-VALUE-EQUATIONS
VIMSCHOOL
Created on October 24, 2024
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Transcript
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: