Solve each rational inequality. Give the solution set in interval notation. (3x + 7)/(x - 3) ≤ 0

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Identify the critical points by setting the numerator and denominator equal to zero separately: solve \(3x + 7 = 0\) and \(x - 3 = 0\). These points divide the number line into intervals.

Determine the intervals based on the critical points found: one interval to the left of the smaller critical point, one between the two critical points, and one to the right of the larger critical point.

Test a sample value from each interval in the inequality \(\frac{3x + 7}{x - 3} \leq 0\) to check whether the expression is less than or equal to zero in that interval.

Include the points where the numerator is zero in the solution set because the expression equals zero there, but exclude points where the denominator is zero since the expression is undefined at those points.

Combine the intervals where the inequality holds true and express the solution set in interval notation, carefully considering whether endpoints are included or excluded.

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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 understanding where the expression is positive, negative, or zero by analyzing the numerator and denominator separately.

Critical Points and Sign Analysis

Critical points are values that make the numerator or denominator 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 Domain Restrictions

Interval notation expresses solution sets compactly using parentheses and brackets to indicate open or closed intervals. Domain restrictions exclude values that make the denominator zero, ensuring the solution set only includes valid inputs for the rational expression.