What is the simplified form of \( 3x + 4x \)?

To simplify the expression ( 3x + 4x ), you combine the like terms. Both terms, ( 3x ) and ( 4x ), share the common variable ( x ).

To combine these expressions, you add the coefficients (the numbers in front of the variables). So you take ( 3 ) (from ( 3x )) and add ( 4 ) (from ( 4x )), resulting in:

[

3 + 4 = 7

]

Thus, when you write the combined terms, you have ( 7x ).

In conclusion, the simplified form of ( 3x + 4x ) is ( 7x ).