Solve the inequality .

Answer and explanation

Correct answer: D.

  1. Step 1: Factorise: . Step 2. The parabola opens upwards, so it is negative between its roots: . **Answer: . Why not the others:** or : That is where the expression is positive. or : The roots have the wrong sign. : The roots have the wrong sign and the interval is on the wrong side of zero.

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