Solve the rational inequality for real numbers .
Answer and explanation
Correct answer: A.
- Step 1: The boundary points are and . Since makes the denominator zero, . Step 2. Testing sign intervals: for , both factors are negative (ratio positive); for , ratio is negative; for , both are positive. Including where numerator is 0 yields . **Answer: . Why not the others:** is where the fraction is negative; incorrectly includes the vertical asymptote ; includes the division by zero.
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