Enter an equation and Pencilbox finds its exact solutions — linear, quadratic and higher-degree polynomials, including irrational and complex roots. Switch to Systems to solve several equations together. Use ^ for powers, * for multiply; you can write an “=” or leave it off (it's taken as “= 0”). Everything runs in your browser.

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Solutions are computed exactly with a self-hosted computer-algebra engine (nerdamer) and typeset with KaTeX — both run on your device. Quadratics and higher-degree polynomials return exact roots, including surds like √2 and complex roots like i. Systems are solved with the linear/algebraic solver; very large or non-polynomial systems may not have a solution the engine can find. Nothing you type is uploaded.