Problem 11 - Algebra 2

Question

Solve each equation. Check your solutions. \(|2 w+3|+6=2\)

Step-by-Step Solution

Answer

The equation has no solutions because an absolute value cannot equal a negative number.

Step 1: Isolate the Absolute Value Expression

To solve the equation \(|2w + 3| + 6 = 2\), the first thing you need to do is isolate the absolute value expression. Subtract 6 from both sides of the equation:\[|2w + 3| = 2 - 6\]which simplifies to:\[|2w + 3| = -4\]

Step 2: Analyze the Absolute Value Equation

At this point, notice that you have \(|2w + 3| = -4\). An absolute value expression \(|x|\) is always non-negative, which means it can never equal a negative number. Therefore, no values for \(w\) will satisfy this equation.

Step 3: Conclusion - No Solution

Because the equation \(|2w + 3| = -4\) cannot be satisfied (since absolute values cannot be negative), this equation has no solutions. There is nothing to check in terms of solutions, as it's clear none exist.

Key Concepts

Solving Absolute Value Equations

Solving absolute value equations involves finding the values of the variable for which the equation holds true. Absolute value refers to the distance a number is from zero on the number line, without considering direction. This means the absolute value is always non-negative. To solve an equation such as \(|x| = a\), where \(a\) is a non-negative number, you would translate it to two possible equations:

• \(x = a\)
• \(x = -a\)

Both equations must be checked in the original equation to ensure they indeed satisfy it. However, if the equation is given in a form which seems to make the absolute value negative (like \(|x| = -a\)), it is typically a signal that no solution exists, as absolute values cannot be negative. For example, in the equation \(|2w + 3| = -4\), \(-4\) is negative, thus making it impossible to solve under regular conditions.

Understanding No Solution in Equations

The concept of "no solution" arises in equations when no valid number satisfies the given equation. In the context of absolute value equations, if you ever find yourself with an equation where the absolute value equals a negative number, it indicates no solution can be found. This occurs because absolute values—being measures of distance—are inherently non-negative:

• This means any attempt to equate an absolute value expression (like \(|2w + 3|\)) with a negative number (such as \(-4\)) would be impossible, as demonstrated in our original problem.

The realization of "no solution" is crucial during problem-solving, preventing you from wasting time looking for answers that don’t exist.

Isolation of Variables: A Key Strategy

When faced with equations, isolating the variable or expression is a fundamental step. This means putting all terms with the variable on one side of the equation and constants on the other. In terms of our absolute value equation, isolation involves getting the absolute value expression by itself:

• In our exercise, we first addressed this by subtracting 6 from both sides, which led to \(|2w + 3| = -4\).

Once isolated, it becomes easier to analyze the equation — determining if solutions exist or if it's a "no solution" scenario. This process is vital not just for absolute values, but for all types of equations, simplifying the problem and making solutions more attainable.