x(x + 8) < 0
-∞__+__( -8 )_-_( 0 )__+__+∞
x ∈ (-8; 0)
x(x + 7) > 0
-∞__+__( -7 )_-_( 0 )__+__+∞
x ∈ (-∞; -7) U (0; +∞)
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Answers & Comments
1 Неравенство
x(x + 8) < 0
-∞__+__( -8 )_-_( 0 )__+__+∞
Ответ
x ∈ (-8; 0)
2 Неравенство
x(x + 7) > 0
-∞__+__( -7 )_-_( 0 )__+__+∞
Ответ
x ∈ (-∞; -7) U (0; +∞)