To simplify the expression 2x + 4x, we can combine the like terms. In this case, both terms have the variable x raised to the power of 1 and the coefficients are 2 and 4 respectively.
Step 1: Combine the coefficients of the like terms.
2x + 4x = (2 + 4)x
Step 2: Simplify the coefficients.
2 + 4 = 6
Step 3: Rewrite the expression using the simplified coefficient.
(2 + 4)x = 6x
Therefore, the simplified form of 2x + 4x is 6x.