How do u write a expression

Writing an expression is basically like writing the same thing you hear or read (contains numbers).

it depends on what expression u want

Step-by-step explanation:

An example of a mathematical expression with a variable is 2x + 3. All variables must have a coefficient, a number that is multiplied by the variable. In the expression 2x + 3, the coefficient of x is the number 2, and it means 2 times x plus 3.