Try It: Solving
To solve the rational inequality , begin by subtracting from both sides to get on the right: . Find the least common denominator (LCD), which is , and rewrite each term to combine them into a single fraction: . Combine and rearrange the numerator: . Next, factor the numerator to obtain . Determine the zero partition numbers by setting the factors of the numerator and denominator to zero. This gives and from the numerator, and from the denominator. Use the partition numbers , , and to divide the number line into intervals: , , , and . By testing values in these intervals, determine where the expression is negative. The quotient is negative in the interval . Because the inequality symbol is strictly less than (<$), the partition numbers are not included. The solution in interval notation is (3, 6)$$.
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Ch.7 Rational Expressions and Functions - Intermediate Algebra @ OpenStax
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Try It: Solving
Try It: Solving
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Identifying the Least Common Denominator for Efficiency Modeling