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30-08-2020
Mathematics

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

What is the solution to the inequality below X2gt81 class=

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Аноним Аноним

11-09-2020

Answer:

A. x ≤ - 9 or x ≥ 9

Step-by-step explanation:

x² ≥ 81

| x | ≥ 9

x ≥ 0 => x ≥ 9 => x ∈ [ 9 ; + oo)

x < 0 => x ≤ - 9 => x ∈ ( -oo ; - 9 ]

x ∈ ( -oo ; - 9 ] ∪ [ 9 ; + oo)

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