Автор - pelmenb42

(х+9)(х^2-9х+81)=-7-4x+x^3​

Ответ

Проверено экспертом

Автор - trscott

(х+9)(х^2-9х+81)= -7-4x+x^3​

х³+9х²-9х²-81х+81х+729 = -7 - 4х + х³

4х + 729 = -7

х = (-7-729)/4 = -736/4 = -184

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