( х^2 + 2х ) = а
а^2 - а - 6 = 0
D = 1 + 24 = 25 = 5^2
a1 = ( 1 + 5 ) : 2 = 3
a2 = ( 1 - 5 ) : 2 = - 2
1) x^2 + 2x - 3 = 0
D = 4 + 12 = 16 = 4^2
X1 = ( - 2 + 4 ) : 2 = 1
X2 = ( - 2 - 4 ) : 2 = - 3
2) x^2 + 2x + 2 = 0
D = 4 - 8 = - 8 ( < 0 )
Нет решений
Ответ 1 ; - 3