In Exercises 59–94, solve each absolute value inequality. 5 > |4 - x|

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Recall that the absolute value inequality \(5 > |4 - x|\) means the distance between \(4 - x\) and \(0\) is less than 5.

Rewrite the inequality without the absolute value as a compound inequality: \(-5 < 4 - x < 5\).

Solve the left part of the compound inequality: \(-5 < 4 - x\). Subtract 4 from both sides to get \(-9 < -x\), then multiply both sides by \(-1\) (remember to reverse the inequality) to get \(x < 9\).

Solve the right part of the compound inequality: \(4 - x < 5\). Subtract 4 from both sides to get \(-x < 1\), then multiply both sides by \(-1\) (reverse the inequality) to get \(x > -1\).

Combine the two inequalities to write the solution as \(-1 < x < 9\).

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주요 개념

질문에 올바르게 답하기 위해 반드시 이해해야 하는 핵심 개념들은 다음과 같습니다.

Absolute Value Definition

The absolute value of a number represents its distance from zero on the number line, always as a non-negative value. For any expression |A|, it equals A if A is non-negative, and -A if A is negative. Understanding this helps in rewriting absolute value inequalities into equivalent compound inequalities.

Solving Absolute Value Inequalities

An inequality involving absolute value, such as |A| < b (where b > 0), can be rewritten as a compound inequality: -b < A < b. This allows solving for the variable by isolating it within these bounds. Recognizing this form is essential to find the solution set for the inequality.

Compound Inequalities

Compound inequalities involve two inequalities joined by 'and' or 'or'. For absolute value inequalities like |4 - x| < 5, the solution is found by solving the compound inequality -5 < 4 - x < 5. Understanding how to manipulate and solve these inequalities is key to determining the correct solution range.