Respuesta :

good evening ,

______

Answer:

x=3 or x= -3

____________________

Step-by-step explanation:

x²=9 ⇔ x²-9=0 ⇔ (x-3)(x+3)=0 ⇔ x-3=0 or x+3=0 ⇔ x=3 or x= -3.

:)