Question

is X = 3 a root of the equation 3 + 2x = 9 ?

Answer 1

if x=3

than
LHS=RHS
3+2*3=9
9=9
LHS=RHS
yes x=3
is the root of the equation

Answer 2

HERE IS YOUR ANSWER.

LHS = 3+2 (3) =3 + 6 = 9 = RHS.

HENCE x = 3 IS A ROOT OF THE EQUATION 3 +2x = 9.

HOPE THIS HELPS YOU.