From the expression in the end, we can distribute the multiplication by 3 to get:
[tex]3(x+4)=3x+12[/tex]The order of the addtion doesn't change the result, so these three expression are the same for every value of x:
[tex]3(x+4)=3x+12=12+3x[/tex]But the other two, 3x + 4 and x + 12, are not the same, so we can check if they will give the same result.
The result for 3(x + 4) is and x = 2 is:
[tex]3(x+4)=3(2+4)=3\cdot6=18[/tex]And the results for 3x + 4 and x + 12 when x = 2 are:
[tex]\begin{gathered} 3x+4=3\cdot2+4=6+4=10 \\ x+12=3+12=15 \end{gathered}[/tex]Which are not the same as 18.
Thus, the expressions that would give different answer are 3x + 4 and x + 12.
