The set of values of $x \in \mathbb{R}$ satisfying the inequality $x^2-4 x-21 \leq 0$ is

The set of values of $x \in \mathbb{R}$ satisfying the inequality $x^2-4 x-21 \leq 0$ is
  1. ${[3,7]}$
  2. ${[-3,7]}$
  3. ${[-7,3]}$
  4. ${[-7,-3]}$

Solution

No solution. Refer to answer key.

Asked in: AP EAMCET 2017 (25 Apr Shift 1)

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