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 

Answer 2

x³ + 5x² - 9x - 45 = 0,
x² × (x+5) - 9(x+5) = 0,
(x+5)(x²-9) = 0,
x+5= 0 или x² - 9 = 0,
x = -5 x = 3 или x = -3