Solve Absolute Value Inequalities © 2011 The Enlightened Elephant.

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Presentation transcript:

Solve Absolute Value Inequalities © 2011 The Enlightened Elephant

First, let’s think about what absolute value inequalities are really asking us to find! © 2011 The Enlightened Elephant

All the numbers whose distance from zero is greater than or ***Notice that you need to have two inequalities to represent the distances that are greater than 4 from zero. What does really mean? © 2011 The Enlightened Elephant

All the numbers whose distance from zero is less than and ***Notice that you need to have two inequalities to represent the distances that are less than 4 from zero. However, since these inequalities must happen at the same time, it should be written as What does really mean? © 2011 The Enlightened Elephant

OK, so how do we solve more difficult problems? © 2011 The Enlightened Elephant

Solve and graph Step 1: Isolate the absolute value. 0 8 © 2011 The Enlightened Elephant Step 2: Set up two inequalities. Step 3: Solve the inequalities. Step 4: Graph the solutions.

Let’s practice! © 2011 The Enlightened Elephant

You Try! Step 1: Solve and graph. Step 2: Step 3: Step 4: Step 5: -5 1 Final answer: -5<x<1 © 2011 The Enlightened Elephant

You Try! Solve and graph Final answer: or Set up two inequalities! © 2011 The Enlightened Elephant

You Try! Solve and graph Final answer: or Isolate the absolute value first! © 2011 The Enlightened Elephant

You Try! Solve and graph. Final answer: Isolate the absolute value first! -2 6 © 2011 The Enlightened Elephant

You Try! Solve and graph. Final answer: Isolate the absolute value first! -3 2 © 2011 The Enlightened Elephant

You Try! Solve and graph. Final answer: NO SOLUTION! Isolate the absolute value first! Absolute values are distances, which cannot be negative. You can choose any value for x and the left side of the inequality will always be positive. However, positive numbers are NEVER less than negative numbers. © 2011 The Enlightened Elephant

You Try! Solve and graph. Final answer: ALL REAL NUMBERS! Isolate the absolute value first! Absolute values are distances, which cannot be negative. You can choose any value for x and the left side of the inequality will always be positive. Positive numbers are ALWAYS greater than negative numbers. © 2011 The Enlightened Elephant