Respuesta :

Answer:

X = -7, -3

(AKA B)

Answer:

x= -7 and x= -3

Step-by-step explanation:

x^2 + 10x = -21

= X^2 + 10x + 21  (Bring the -21 to the other side to make it positive)

factor the equation...

= (x+7)(x+3)

x= -7 and x= -3

if you need help on how to factor I can help