Solve each rational inequality in Exercises 43–60 and graph the solution set on a real number line. Express each solution set in interval notation. (−x−3)/(x+2)≤0

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Identify the rational inequality: \(\frac{-x - 3}{x + 2} \leq 0\).

Find the critical points by setting the numerator and denominator equal to zero separately: solve \(-x - 3 = 0\) and \(x + 2 = 0\).

Determine the critical points: from \(-x - 3 = 0\), solve for \(x\); from \(x + 2 = 0\), solve for \(x\). These points divide the number line into intervals.

Test each interval by choosing a test value from each interval and substituting it into the inequality \(\frac{-x - 3}{x + 2} \leq 0\) to check if the inequality holds.

Based on the test results, write the solution set in interval notation, remembering to exclude any points where the denominator is zero and include points where the expression equals zero if the inequality is non-strict (\(\leq\)).

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주요 개념

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

Rational Inequalities

Rational inequalities involve expressions where one polynomial is divided by another, and the inequality compares this ratio to zero or another value. Solving them requires finding where the rational expression is positive, negative, or zero by analyzing the signs of numerator and denominator.

Critical Points and Sign Analysis

Critical points occur where the numerator or denominator equals zero, dividing the number line into intervals. By testing values in each interval, you determine the sign of the rational expression, which helps identify where the inequality holds true.

Interval Notation and Graphing Solutions

After determining the solution intervals, express them using interval notation to clearly show the range of values satisfying the inequality. Graphing on a number line visually represents these intervals, indicating included or excluded points based on inequality symbols.