Решите уравнения: 1) х2 + 3x + 2 = 0
2) х2 - 2x – 3 = 0
3) – 2х2 - 10x – 8 = 0
4) x2 – 2х – 4 = 0
5) 3х2 - x+4 = 0
6) 9х2 + 12х + 4 = 0
7) 7х2 + 9x + 2 = 0​

1) (-2;-1)  2) (-1;3)  3) (11.5; 6.5) 4) (; )  5) (1; )  6) ()  7) (-1 ; )

Пошаговое объяснение:

1) x² + 3x + 2= 0

D = 3² - 4 * 2 = 1

2) x² - 2x - 3 =0

D = (-2)² - 4 * (-3) = 16

3) -2x² - 10x - 8 = 0

D = (-10)² - 4 * (-2) * (-8) = 36

4) x² - 2x - 4 = 0

D = (-2)² - 4 * (-4) = 20

5) 3x² - x + 4 = 0

D = 49

6) 9x² + 12x + 4 = 0

D = 0

7) 7x² + 9x  + 2= 0

D = 25