Respuesta :

Yang100

Answer:

x=3, -5.

Step-by-step explanation:

x^2+2x+25=40

x^2+2x+25-40=0

x^2+2x-15=0

factor out the trinomial,

(x-3)(x+5)=0

zero property,

x-3=0, x+5=0,

x=0+3=3,

x=0-5=-5.