Algebra Solver

Quadratic equations and proportions solver.

1x² + 0x − 4 = 0

Discriminant (b²−4ac)16

Roots-2, 2

175 available

Annuity and differentiated monthly installments, interest breakdown, and amortization schedule.

Calculate PITI (Principal, Interest, Taxes, Insurance), PMI, and accelerated payoff savings.

Visualize compound growth with recurring deposits, annual rate, and investment horizons.

Add or extract Value Added Tax (VAT) with international country presets.

Analyze profitability and percentage return on business capital and investments.

Gross to net salary with income tax, social contributions and deductions, monthly and annual.

About this calculator

Quadratic equations with discriminant and roots plus rule-of-three proportions, live as you type.

Negative discriminant?

No real roots — the parabola never crosses zero; try complex-capable tools for those.

Linear case?

With a = 0 the equation is linear: single root −c/b.

Proportion formula?

a/b = c/x gives x = b·c/a.