Question

(-x-1)(x+2)+12=0 ECUACION DE SEGUNDO GRADO

Answer 1

(-x-1) (x+2) + 12 = 0
- x² - 2x - x -2 + 12 = 0
- x² - 3x + 10 = 0
 -x              2
  x              5

- x + 2 = 0    V   x + 5 = 0
x = 2          V    x = - 5

Answer 2

(-x-1) (x+2) + 12 = 0
- x² - 2x - x -2 + 12 = 0
- x² - 3x + 10 = 0
( -x - 2)
( x - 5)
-x-2=0
x + 2 = 0 -> x -5 = 0
x = -2 -> x = 5