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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:

  1. First type the expression 2x.
  2. Then type the @ symbol.
  3. Then type x=3.
Try it now: 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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