Respuesta :

amna04352

Answer:

1. -2, -4

2. 7, ½

3. -2, -3

Step-by-step explanation:

1) -x² - 6x - 8 = 0

x² + 6x + 8 = 0

x² + 4x + 2x + 8 = 0

x(x + 4) + 2(x + 4) = 0

(x + 2)(x + 4) = 0

x = -2 , -4

2) 2x² - 15x + 7

2x² - 14x - x + 7 = 0

2x(x - 7) - (x - 7) = 0

(2x - 1)(x - 7) = 0

x = ½, 7

3) 3x² + 15x + 18 = 0

x² + 5x + 6 = 0

x² + 3x + 2x + 6 = 0

x(x + 3) + 2(x + 3) = 0

(x + 3)(x + 2) = 0

x = -2, -3