### Home > MC1 > Chapter 4 > Lesson 4.3.4 > Problem 4-123

4-123.

Remember that the expression for part (a) is *x* + 1 + *x*.

If you put in the value for x and simplified the expression, what answer would you get?

Try the problem on your own before checking the answer.

Look back at part (b) of 4-122. Using the expression you wrote, substitute 4 for ''*m*'' and simplify the expression.

This problem is very similar to parts (a) and (b). If you are having trouble, refer to those problems.