Question

решите уравнение сложное

Answer 1

x^3 + 5x^2 - 9x - 45 = 0
x^2( x + 5 ) - 9( x + 5 ) = 0
( x^2 - 9 )( x + 5 ) = 0
( x - 3 )( x + 3 )( x + 5 ) = 0
x - 3 = 0
x = 3 
x + 3 = 0
x = - 3 
x + 5 = 0 
x = - 5 
Ответ ( - 5 ); ( - 3 ); 3