Polynomial Evaluator
Evaluate polynomial expressions for any x value with coefficient lists and step-by-step substitution.
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Evaluate polynomials for any x
Enter coefficients from lowest degree to highest (constant term first). For example,
1, -2, 3 defines P(x) = 1 − 2x + 3x². The tool substitutes your x value,
shows each non-zero term, and prints the numeric result instantly.
How to use it
- List coefficients separated by commas or spaces.
- Enter the x value (decimals allowed).
- Read P(x) and the per-term breakdown.
For graphing or finding roots, try the Polynomial Graphing Calculator.
Frequently Asked Questions
Which coefficient order is used?
Index 0 is the constant term, index 1 is x, index 2 is x², and so on.
Can I use negative coefficients?
Yes. Use minus signs in the list, for example 0, -1, 2.
Where does computation run?
All evaluation happens locally in JavaScript; nothing is uploaded.
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