Question

help​

Answer 1

(x+7)(x-5)>0

Рассмотрим все возможные случаи:

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{x + 7 > 0

{x - 5 > 0

и

{x + 7 < 0

{x - 5 < 0

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{x > - 7

{x > 5

и

{x < -7

{x < 5

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Тогда:

x ∈ (5; + ∞)

и

х ∈ ( - ∞; - 7)

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Ответ: х ∈ ( - ∞; - 7) ∩ (5; + ∞)

Answer 2

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