## Algebra 2 Assignment Evaluate Each Expression Examples

Learn how to use the **Algebra Calculator** to evaluate expressions.

### Example Problem

**Evaluate the expression 2x for x=3.**

### How to Evaluate the Expression in Algebra Calculator

First go to the Algebra Calculator main page.

Type the following:

- First type the expression
**2x**. - Then type the
**@**symbol. - Then type
**x=3**.

**2x @ x=3**

### Clickable Demo

Try entering 2x @ x=3 into the text box.After you enter the expression, Algebra Calculator will evaluate 2x for x=3: 2(3) = 6.

### More Examples

Here are more examples of how to evaluate expressions in Algebra Calculator. Feel free to try them now.### Need Help?

Please feel free to Ask MathPapa if you run into problems.### Related Articles

A variable is a letter, for example x, y or z, that represents an unspecified number.

$$6+x=12$$

To evaluate an algebraic expression, you have to substitute a number for each variable and perform the arithmetic operations. In the example above, the variable x is equal to 6 since 6 + 6 = 12.

If we know the value of our variables, we can replace the variables with their values and then evaluate the expression.

**Example**

Calculate the following expression for x=3 and z=2

$$6z+4x=\: ?$$

Solution: Replace x with 3 and z with 2 to evaluate the expression.

$$6z+4x=\: ?$$

$$6\cdot {\color{blue} 2}+ 4\cdot {\color{blue} 3}=?$$

$$\: \, 12+12=24$$

**Video lesson**

Evaluate the following expression for x = 2, y = 5 and z = 4

$$4x+(7-z)-6y$$

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