write a phrase of algebraic expression for 3x

the product of 3 and x

The phrase "3x" can be expressed algebraically as "three times x" or in short, "3 times x". To write it as a mathematical expression, you can simply write "3x". Here, the variable "x" represents an unknown value or quantity, and multiplying it by 3 means we are multiplying "x" by the number 3.

It could be:

3 times the number x