1. The problem is to check if substituting $x=3$ into an expression equals 128. 2. Since the expression is not given, let's assume the expression is $f(x)$ and we want to verify if $f(3) = 128$. 3. To verify, substitute $x=3$ into the expression and simplify. 4. If the result is not 128, then the statement is false. Please provide the exact expression for $f(x)$ to check the substitution properly.