Respuesta :

Answer:

if X =3 then X would be equal to 12

Step-by-step explanation:

x3+x

put x=3

(3)3+3

9+3

12

ZJSG09112007

Answer:

Step-by-step explanation:

[tex]x=3 \\3(x)+x\\3(3)+3\\9 +3\\= 12\\ X= - 3 \\ 3(x)+x\\3(-3)+(-3)\\-9-3\\= -12[/tex]