How does this simplify expressions without doing algebra step by step?

It evaluates the expression at a few sample x values and reconstructs the equivalent simplified polynomial from those results — any two algebraically equivalent expressions always produce identical output at every input, so this recovers the correct simplified form regardless of how the original was written.

Can this simplify expressions with more than an x² term?

No — it's built for linear and quadratic expressions (degree 1 and 2 in x). Higher-degree expressions, or ones involving trigonometric or logarithmic functions of x, fall outside what it can simplify and will show an error instead of an incorrect result.

What's the difference between this and the Equation Solver tool?

The Equation Solver finds the value(s) of x that make an equation true (something = something else). This tool works with a single expression (no equals sign) and simplifies it or evaluates it at a chosen x — related but different tasks.

Why would I want to evaluate an expression instead of just simplifying it?

Sometimes you need the expression's value for one specific case rather than its general simplified form — like checking what a formula gives at a particular input, or verifying your simplified version actually matches the original by testing both at the same x.

Is (x+2)^2 the same as x^2 + 4?

No — this is a very common algebra mistake. (x+2)^2 expands to x² + 4x + 4 (via the FOIL method or binomial expansion), not x² + 4. This tool's simplification would immediately reveal that discrepancy if you tested both forms.

Combine Like Terms Calculator — Free Tool

Features

Runs entirely in your browser
Privacy-first — your data is never uploaded
Real-time, instant results
100% free, no sign-up required
Works on desktop, tablet, and mobile
No installation needed

Who uses this tool?

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About Combine Like Terms Calculator

An algebraic expression like 3x + 2(x − 4) + 7 can be simplified by expanding parentheses and combining like terms — a process that's mechanical but easy to make a small sign or arithmetic error in, especially with multiple parentheses or negative coefficients involved.

This tool simplifies any linear or quadratic expression in x into its cleanest equivalent form (like 5x − 1), regardless of how the original expression is written. Rather than symbolically expanding and combining terms the way a person would on paper, it evaluates the expression at a few sample points and mathematically reconstructs the underlying simplified polynomial — a technique that's immune to the sign errors and dropped terms that make manual simplification error-prone.

Beyond simplifying, you can also evaluate the expression at any specific value of x — useful for checking a specific case, plugging in a known value, or verifying that a simplified form actually matches the original expression by testing it against the same input.

This is useful for checking algebra homework for expansion and simplification errors, evaluating an expression at a specific value quickly, verifying that two differently-written expressions are actually equivalent, and general algebra practice and learning.

How it works

Enter an expression in x. Including parentheses, exponents, and coefficients as needed.
See the simplified form. Expanded and combined into its cleanest equivalent expression.
Optionally evaluate at a specific x. Plug in any number to see the expression's value there.

Examples

Simplifying an expression with parentheses

Input

3x + 2(x - 4) + 7

Output

5x - 1

Expanding a squared binomial