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Solve: \(6|1-2 x|-7=11\). (Section P.7, Example 6 )

Short Answer

Expert verified
The solutions to the equation are \(x=-1\) and \(x=2\).

Step by step solution

01

Isolate the absolute value term

Our current equation is \(6|1-2 x|-7=11\). To isolate the absolute value term, firstly add 7 on both sides, it changes the equation to: \(6|1-2x|=18\). Then divide both sides by 6. So our equation becomes: \(|1-2x|=3\).
02

Split into two separate equations

Once the absolute value term has been isolated, the equation should be split into two: \(1-2x=3\) and \(1-2x=-3\). Which means the value inside the absolute quotes to be equal to 3 or -3.
03

Solve the equations

Now it's time to solve these equations. From the first equation, solve for x by subtracting 1 from both sides: \(1-2x-1=3-1 \rightarrow -2x=2\), divide by -2 on both sides to find \(x=-1\). The same way, solve the second equation: \(1-2x-1=-3-1 \rightarrow -2x=-4\), divide by -2 to find \(x=2\). So the solutions are \(x=-1\) and \(x=2\).

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Solving Absolute Value Equations
Absolute value equations can be tricky at first, but they're easier to handle once you understand the basic steps. These types of equations involve expressions wrapped within absolute value symbols. The absolute value of a number is always a non-negative value, representing the distance from zero on a number line. Solving such equations generally involves isolating the absolute value expression and then dealing with the two possible scenarios.

Let's begin by noting that the goal of solving any equation is to find the value(s) of the variable that make the equation true. For absolute value equations, isolation of the absolute value term is often the first step. Once isolated, the equation is split into potential scenarios, as each result inside the absolute value can be either positive or negative, leading to two different equations to solve.

When both equations are solved, you obtain the possible solutions for the equation. In many cases, these solutions need to be checked back in the original equation to ensure they satisfy the absolute value condition.
Isolation of Terms
Isolating terms is an essential skill in algebra, especially when dealing with absolute value equations. When you want to solve an equation involving absolute values, the first step is to isolate the absolute value term on one side of the equation. Let's walk through this process.

Consider the equation given in the exercise: \(6|1-2x|-7=11\). The target is to get \(|1-2x|\) by itself. This involves a few operations:
  • Add or subtract: Remove any constants added or subtracted from the absolute term. For our example, add 7 to both sides to get \(6|1-2x|=18\).
  • Division or multiplication: If there's a coefficient in front of the absolute term, as with the 6 in this example, divide both sides by this number. Doing this simplifies the equation to \(|1-2x|=3\).
With the absolute value term isolated, you are ready for the next step of splitting into two equations based on definition.
Splitting into Equations
After isolating the absolute value, the next step to solving the equation is to split it into two separate equations. The absolute value equation \(|A| = B\) implies two potential scenarios: \(A = B\) and \(A = -B\). This reflects that the expression inside the absolute value can result in either the positive or the negative value.

Taking our example, with \(|1-2x|=3\), we can split it into the following two equations:
  • \(1-2x = 3\), which reflects the expression when it equals the positive value.
  • \(1-2x = -3\), representing the case when the expression is equivalent to the negative value of absolute value.
Next, solve each equation individually:

For the equation \(1-2x = 3\): subtract 1, and then divide by -2 to find \(x = -1\).
For the equation \(1-2x = -3\): similarly, subtract 1, and divide by -2 to find \(x = 2\).
Therefore, the solutions to the original equation are \(x = -1\) and \(x = 2\). Always make sure to check both solutions to ensure they satisfy the original condition.

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Most popular questions from this chapter

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Mega Millions is a multi-state lottery played in most U.S. states. As of this writing, the top cash prize was \(\$ 656\) million, going to three lucky winners in three states. Players pick five different numbers from 1 to 56 and one number from 1 to \(46 .\) Use this information to solve Exercises \(27-30 .\) Express all probabilities as fractions. A player wins a minimum award of \(\$ 10\) by correctly matching two numbers drawn from white balls ( 1 through 56 ) and matching the number on the gold Mega Ball" ( 1 through 46 ). What is the probability of winning this consolation prize?

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