Ответ:
n(n+6)+9≤0
n²+6n+9≤0
(n+3)²≤0
(n+3)²=0
n²=-3²=-9
n=-3
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Ответ:
n(n+6)+9≤0
n²+6n+9≤0
(n+3)²≤0
(n+3)²=0
n²=-3²=-9
n=-3