# How to write absolute value equations as piecewise equations in standard

This is the graph of y or f of x is equal to two times the absolute value of x plus three, plus two. Therefore, the piecewise function is: You could view this as the same thing as y is equal to the absolute value of x minus negative three.

To solve your first side the original oneyou will move any numbers without variables to the other side. To solve an equation, you seperate it into two different equations.

Both sides of the equation contain absolute values and so the only way the two sides are equal will be if the two quantities inside the absolute value bars are equal or equal but with opposite signs. But x - 2 cannot be negative.

When whatever we have inside the absolute value sign is positive, we're going to get essentially, this slope of one.

March Learn how and when to remove this template message In mathematicsa piecewise-defined function also called a piecewise function or a hybrid function is a function defined by multiple sub-functions, each sub-function applying to a certain interval of the main function's domain, a sub-domain. So now I wanna graph, and we're in the home stretch, I wanna graph, y is equal to two times the absolute value of x plus three, plus two. And then that last piece, says shift up by two. To review how to obtain equations from linear graphs, see Obtaining the Equations of a Line, and from quadratics, see Finding a Quadratic Equation from Points or a Graph.

The next step is to remove the absolute value bars and set one version equal to the original number, 7, and the other version equal to the negative value of that, i.

Therefore, the piecewise function is: All right, now let's keep building. And then that last piece, says shift up by two. So let me get my ruler out again and see if I can draw that. Stretch vert by two. Y is equal is to the absolute value of x plus three. Well whatever y value I was getting for this orange function, I now wanna add two to it.

Likewise, there is no reason to think that we can only have one absolute value in the problem. For example, the absolute value of -2 -- written as -2 -- is equal to 2.

It's gonna look something like this. Obtaining Equations from Piecewise Function Graphs You may be asked to write a piecewise function, given a graph. So if we shift three to the left, it's gonna look something like And what they've already graphed for us, this right over here, this is the graph of y is equal to the absolute value of x. And, even better, a site that covers math topics from before kindergarten through high school. Let me draw that. Piecewise Functions A Function Can be in Pieces. We can create functions that behave differently based on the input (x) value.

A function made up of 3 pieces. The only places where we need to break the function into "pieces" are those points where the expression inside each absolute value becomes zero. Evaluate results of piecewise functions. Anchor Standard Common Core Math Standards. elleandrblog.com7 cube root, and piecewise-defined functions, including step functions and absolute value functions. Additional standards alignment can be found at the end of this lesson.

Teaching Summary Getting Started. 1 write an equation to express one. These absolute value word problems in this lesson will explore real life situations that can be modeled by either an absolute value equation or an absolute value inequality.

You may need to review the lesson about how to solve absolute value equations and absolute value inequalities. Piecewise-Defined, Composite, and Inverse Functions p. 99 • absolute value equation • absolute value inequality • constraints • consistent • inconsistent Equations, 1 Inequalities, Functions ESSENTIAL QUESTIONS How are linear equations and systems of equations.

ABSOLUTE VALUE AND PIECEWISE FUNCTIONS In order to remove the absolute value sign from a function you must: 3. Rewrite the equation without the absolute value as a piecewise function.

For each interval where the expression is positive we can write that interval by just dropping the absolute value. Write as a piecewise function. How to write absolute value equations as piecewise equations in standard
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Piecewise Functions