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Galina-37 [17]
3 years ago
15

What is the solution to the inequality below? X^2>=81

Mathematics
1 answer:
kotegsom [21]3 years ago
7 0
  • Answer:

<em>A. x ≤ - 9 or x ≥ 9</em>

  • Step-by-step explanation:

<em>x² ≥ 81</em>

<em>| x | ≥ 9</em>

<em>x ≥ 0 => x ≥ 9 => x ∈ [ 9 ; + oo)</em>

<em>x < 0 => x ≤ - 9 => x ∈ ( -oo ; - 9 ]</em>

<em>x ∈  ( -oo ; - 9 ] ∪ [ 9 ; + oo)</em>

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Hi, to answer this question we have to apply the formula:

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