The solution will be all points that are more than two units away from zero.">

# How do you write an absolute value inequality from a number line

The absolute value is always positive, so you can think of it as the distance from 0. I like to then make the expression on the right hand side without the variables both positive and negative and split the equation that way.

In this case our answer is all real numbers, since an absolute value is always positive. Here are more problems: Try the answers in the original equation to make sure they work!

Note that we still have to simplify first to separate the absolute value from the rest of the numbers. Check the answers; the work! Note that we get some complex roots since we had to take the square root of a negative number. We need to treat the absolute value like a variable, and get it out from the denominator by cross multiplying.

Then we can continue to solve, and divide up the equations to get the two answers. Check the answers — they work! In this case, we have to separate in four cases, just to be sure we cover all the possibilities.

Solving Absolute Value Inequalities When dealing with absolute values and inequalities just like with absolute value equationswe have to separate the equation into two different ones, if there are any variables inside the absolute value bars.

How Do You Graph an Inequality or an Infinite Set on a Number Line? Number lines are really useful in visualizing an inequality or a set. In . The ``forget the minus sign" definition of the absolute value is useless for our purposes. Instead, we will mostly use the geometric definition of the absolute value: The absolute value of a number measures its distance to the origin on the real number line. Since 5 is at 5 units distance from the. Watch video · If you multiply both sides by 2/9, it's a positive number, so we don't have to do anything to the inequality. These cancel out, and you get x is less than 3 times 2/9. 3/9 is the same thing as 1/3, so x needs to be less than 2/3.

We first have to get the absolute value all by itself on the left. Now we have to separate the equations. We get the first equation by just taking away the absolute value sign away on the left. The easiest way to get the second equation is to take the absolute value sign away on the left, and do two things on the right: Here are some examples: Even with the absolute value, we can set each factor to 0, so we get —4 and 1 as critical values.

Then we check each interval with random points to see if the factored form of the quadratic is positive or negative, making sure we include the absolute value.

Then we need to get everything to the left side to have 0 on the right first. Simplify with a common denominator. We see the solution is: Graphs of Absolute Value Functions Note that you can put absolute values in your Graphing Calculator and even graph them!

Absolute Value functions typically look like a V upside down if the absolute value is negativewhere the point at the V is called the vertex. Applications of Absolute Value Functions Absolute Value Functions are in many applications, especially in those involving V-shaped paths and margin of errors, or tolerances.

Problem Solution Two students are bouncing-passing a ball between them. Create an absolute value equation to represent the situation.

How high the did the ball bounce for the second student to catch it? Suppose that a coordinate grid is placed over a putt-putt golf course, where Amy is playing golf. Write an equation for the path of the ball. Here are examples that are absolute value inequality applications: This makes sense since anything outside of these values would be more than.

And we also know the difference of the temperature and 72 has to be in this range. Therefore, we can write this temperature range as an absolute value and solve: A bird is approaching Erin, a photographer, and she films it.

She starts her video when the bird is feet horizontally from her, and continues filming until the bird is at least 50 feet past her. The bird is flying at a rate of 30 feet per second. Write and solve an equation to find the times after Erin starts filming that the bird is 50 feet horizontally from her.write an absolute value inequality for 35 degrees C with the temperature able to vary as much as 1% For your chemistry experiment, you are trying to keep the water temperature at 35°C.

For the experiment to work properly, the actual temperature can vary as much as 1%. The other case for absolute value inequalities is the "greater than" case.

Let's first return to the number line, and consider the inequality | x | > The solution will be all points that are more than two units away from zero. Compound Inequalities are two inequalities presented as one problem.

The variable being solved for may need to only fulfill only one of the inequalities, or both, depending on if the word "and" or "or" is used. Note: Trying to solve an absolute value inequality? No sweat! This tutorial will take you through the process of solving the inequality. Then you'll see how to write the answer in set builder notation and graph it on a number line.

To CHECK: pick a number anywhere in the solution set and substitute into the ORIGINAL ABSOLUTE VALUE INEQUALITY.

a absolute value caninariojana.comok September 13, The solutiuon set is written x2, or in interval notation (­ ∞,­2)∨(2,∞) and we see the solution is .

Recall that the absolute value The distance from the graph of a number a to zero on a number line, denoted | a |. of a real number a, denoted | a |, is defined as the distance between zero (the origin) and the graph of that real number on the number line.

Inequality Expressions - Algebra | Socratic