Solve for x: .
Answer and explanation
Correct answer: A.
- Step 1: Factorise: ; critical values and .
- Step 2: The parabola opens upwards, so the expression is positive or zero outside the roots: .
Answer
.
Why not the others: : the parabola opens upward, so this is the region where the expression has the opposite sign. : the signs of the critical values are reversed. : endpoints are excluded, but the inequality is not strict.
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