Respuesta :

Answer:

A.  x = -4 +/-√26.

Step-by-step explanation:

x^2 + 8x = 10

using the completing the square identity:

x^2 + ax = (x + a/2)^2 - (a/2)^2 :

(x + 4)^2 - 4^2 = 10

(x + 4)^2 = 26

x + 4 = ± √26

x = -4 +/-√26.