In Exercises 59–94, solve each absolute value inequality. 3|x - 1| + 2 ≥ 8

검증된 단계별 안내

Start by isolating the absolute value expression. Subtract 2 from both sides of the inequality: 3\|x - 1\| + 2 \(\geq\) 8 becomes 3\|x - 1\| \(\geq\) 6.

Next, divide both sides of the inequality by 3 to solve for the absolute value: \|x - 1\| \(\geq\) 2.

Recall that the inequality \|A\| \(\geq\) B (where B > 0) means A \(\leq\) -B or A \(\geq\) B. Apply this to \|x - 1\| \(\geq\) 2, giving two inequalities: x - 1 \(\leq\) -2 or x - 1 \(\geq\) 2.

Solve each inequality separately: For x - 1 \(\leq\) -2, add 1 to both sides to get x \(\leq\) -1. For x - 1 \(\geq\) 2, add 1 to both sides to get x \(\geq\) 3.

Combine the solutions to write the final solution set: x \(\leq\) -1 or x \(\geq\) 3.

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주요 개념

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Absolute Value Inequalities

An absolute value inequality involves expressions with absolute value symbols, which represent the distance from zero on the number line. To solve these, you often split the inequality into two separate cases based on the definition |A| ≥ B meaning A ≤ -B or A ≥ B, provided B is non-negative.

Isolating the Absolute Value Expression

Before solving an absolute value inequality, isolate the absolute value term on one side of the inequality. This often involves algebraic manipulation such as subtracting or dividing terms, which simplifies the problem and allows you to apply the definition of absolute value inequalities correctly.

Solving Linear Inequalities

After splitting the absolute value inequality into two linear inequalities, solve each inequality separately using standard methods. This includes adding, subtracting, multiplying, or dividing both sides by constants, while remembering to reverse the inequality sign when multiplying or dividing by a negative number.