And then you have the scenario where x plus 3 is less than 0. Based on the images below, calculate the gas mileage for the previous tank of gas. This is saying that the quantity in the absolute value bars has a distance of zero from the origin.

So the absolute value of negative 1 is 1. Well, if you subtract 3 from both sides, you get x is greater than negative 3. So you kind of have this v-shaped function, this v-shaped graph, which is indicative of an absolute value function. That will almost always be the case.

We use the absolute value when subtracting a positive number and a negative number. Learn these rules, and practice, practice, practice! Example 1 - One Solution Pay careful attention to how we arrive at only one solution in this example.

You get x is equal to But when is x plus 3 greater than 0? This will be better understood with an example. If you know you're taking the absolute value of a negative number, it's just like multiplying it by negative 1, because you're going to make it positive.

Sciencing Video Vault 1.

This will become a negative It has its y-intercept at positive 3. That's my x-axis, that's my y-axis. Or 4x minus 1 might evaluate to negative Example 1 Solve each of the following. This is simply incorrect and will almost never get the correct answer.

We only exclude a potential solution if it makes the portion without absolute value bars negative. So it would look like this.Students will write the equation of the absolute value represented by the graph.

In general, to solve an equation with an absolute value: Perform inverse operations until the absolute value stands by itself on one side of the equation--the equation should be of the form| expression | = c.

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. Or in other words, we must have.

More Formal. More formally we have: Which says the absolute value of x equals: x when x is greater than zero; 0 when x equals 0 −x when x is less than zero (this "flips" the number back to positive); So when a number is positive or zero we leave it alone, when it is negative we change it to positive using −x.

The absolute value of a number is the value of the number without consideration of whether it represents a positive or negative value. By definition, an absolute value can never be a negative value. Another way to think of the absolute value would be to look at a number line with zero in the middle.

Graphing absolute value functions or equations, examples Quadratic equations with absolute value Graphical interpretation of the definition of the absolute value of a function y = f (x) will help us solve an equation with absolute value.

DownloadHow to write an absolute value equation

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