Enter any algebraic expression and assign values to each variable. The calculator walks you through every substitution and simplification step so you can see exactly how the final answer is reached.
^ for powers, e.g. x^2.
Write coefficients right before variables: 2x.
To evaluate an expression means to find its numerical value by replacing every variable with a given number, then computing the result using order of operations.
Think of a variable as a blank placeholder. Evaluating is like filling in the blank with a specific number and then calculating.
For example, to evaluate 3x + 2 when x = 5:
3(5) + 2 = 15 + 2 = 17
When you substitute a value — especially a negative number — wrapping it in parentheses prevents sign errors.
Consider x² when x = −3:
(-3)² = 9 ✓ vs -3² = −9 ✗
The parentheses make it clear that the negative sign is part of the base being squared, not a separate negative applied to 9.
This calculator always wraps substituted values in parentheses so the math stays correct — and so you can see this habit modelled in every step.
Work through evaluating expressions, order of operations, and more with a patient one-on-one tutor — online, on your schedule.