Polynomial Evaluator
Algebra
Type a polynomial and an x; get value + derivative.
Polynomial input
Results
Horner's rule : step-by-step evaluation at x = 2
| Step i | Coefficient cᵢ | Computation | Running value |
|---|---|---|---|
| 0 | 1 | (0) · 2 + 1 = 1 | 1 |
| 1 | 0 | (1) · 2 + 0 = 2 | 2 |
| 2 | -4 | (2) · 2 + -4 = 0 | 0 |
| 3 | 3 | (0) · 2 + 3 = 3 | 3 |
Frequently asked questions
▶What does the Polynomial Evaluator do?
The Polynomial Evaluator is an interactive algebra lab where you change inputs and the answers update live, helping you build intuition without doing the arithmetic by hand.
▶Who should use the Polynomial Evaluator?
Students from primary to senior secondary classes, parents helping with homework, and anyone revising algebra can use this lab to check answers and explore "what-if" scenarios.
▶Is the Polynomial Evaluator free to use?
Yes. Every lab on math.suparnpatra.com is free and runs entirely in your browser : nothing is sent to a server.
▶Does the Polynomial Evaluator work offline?
Once the page is loaded, all calculations run locally in JavaScript, so you can keep using it even on a flaky connection.
▶How accurate are the results?
Results use standard JavaScript double-precision arithmetic and the textbook formula for algebra. We never display scientific notation : numbers are shown as ordinary decimals you can read at a glance.