Question

Решить уравнение
X^3+2X^2-9X-18=0

Answer 1

( X^3 + 2X^2) - ( 9X + 18) = 0 
X^2 * ( X + 2 ) - 9 * ( X + 2 ) = 0 
( X + 2 ) * ( X^2 - 9 ) = 0 
( X + 2 ) * ( X - 3 ) * ( X + 3 ) = 0
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X + 2 = 0 ---> X = ( - 2 ) 
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X - 3 = 0 ---> X = 3 
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X + 3 = 0 ----> X = ( - 3 )
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Ответ: ( - 2); ( - 3 ) ; 3 

Answer 2

спасибо!

Answer 3

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