When the inside expression includes variables and you do not know anything about the values of the variables, then writing the expression without absolute values takes a bit more care and our reliance on the definition above becomes more obvious.

The student correctly writes the second inequality as or.

In certain places, such as calculator and computer programs, you may see it written as abs xwhich naturally means "the absolute value of x," but x is the common way your teacher probably wants you to write it on your homework and tests.

The absolute value of 7 minus 2.

The number -9 is the same distance from zero, so its absolute value is also just 9. The reasoning here is similar to the last example. Well, 7 minus 2 is 5, so this is the same thing as the absolute value of 5. Jo Steig The absolute value symbol is really shorthand for what we call a piecewise described function.

You will investigate addition, integration, and differentiation in a later course. Instructional Implications Review the concept of absolute value and how it is written. Then explain why the equation the student originally wrote does not model the relationship described in the problem.

How did you solve the first absolute value inequality you wrote? Using the absolute value guarantees we have a positive value inside the bars, so the negative sign will definitely make it negative.

This takes the number, makes it positive, and then negates it. So let me do a number line. How far is 5 away from 0?

Can you explain what the solution set contains? What is the difference? Does not represent the solution set as a disjunction. Review, as needed, how to solve absolute value inequalities. This means that any equation that has an absolute value in it has two possible solutions.

The following three examples illustrate 1. This is true because as long as x is larger than 4, x - 4 will be positive. What are the solutions of the first equation? Ask the student to solve the equation and provide feedback. Before you can access the information you must first run a decompression program.Solved: Write and absolute value equation that has the given solutions of x=3 and x=9 - Slader/5(1).

Learn how to solve absolute value equations and how to graph absolute value functions. Learn for free about math, art, computer programming, economics, physics, chemistry, biology, medicine, finance, history, and more.

That is, the absolute value of a number, a, is equal to the distance that 'a' is from zero. The two statements (above) are needed to define absolute value in order to insure that the output of an absolute value function is NEVER less than zero. Absolute Value Introduction.

The absolute value of a number is its value, or magnitude, without respect to sign. It's the "amount" you are working with expressed as a positive number, ignoring any negative sign. Encourage students along every step of the learning journeyAdaptive & Individualized · Immediate Feedback · K Math & EnglishCourses: Math, English, Science, Social Studies, Spanish.

Students are asked to write absolute value inequalities to represent the relationship among values described in word problems. the student is unable to correctly write an absolute value inequality to represent the described constraint.

Be sure to include situations that give rise to absolute value equations of the form |x – a.

DownloadHow to write absolute value equations on a computer

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