Algebra & Equations

This subcategory offers 4 tools for solving expressions and systems. Quadratic Equation, 2x2 Linear System and Matrix calculator cover common cases. Modular arithmetic completes the page. They are free and need no account, useful for pupils, students and anyone checking a calculation before moving on.

Start with the shape of your problem. Quadratic Equation handles ax2 + bx + c = 0 over the reals, 2x2 Linear System solves two equations with two unknowns and Matrix calculator adds, multiplies or computes a determinant. Modular arithmetic deals with a modulo, an inverse or a modular power. The right tool is the one whose statement matches your exercise.

How to use

  1. Recognise the form of the statement: quadratic equation, system with two unknowns, matrix or modular calculation.
  2. For an equation ax2 + bx + c = 0 over the reals, use Quadratic Equation and check the sign of the discriminant.
  3. For two equations with two unknowns, open 2x2 Linear System. For matrices, use Matrix calculator and choose the operation you need.
  4. For a remainder, an inverse or a modular power, use Modular arithmetic, then check the result with a simple example.

Frequently asked questions

Can I solve an equation with complex roots?

The listing says Quadratic Equation solves over the reals. If the discriminant is negative, it therefore does not cover complex solutions. Check the statement before using it.

Does Matrix calculator perform several operations?

Yes, its description mentions addition, multiplication and determinant. For a system with two unknowns, use 2x2 Linear System instead. For remainders, switch to Modular arithmetic.

Do these tools show the steps?

The listing presents the tools as free calculators without sign-up. Use them to check a result, then redo the reasoning if your course requires it.

What if Quadratic Equation gives no real solution?

The listing states that the tool solves over the reals. If the discriminant is negative, it therefore does not cover complex solutions. Read the statement again or use another method suited to your course.

Can Matrix calculator check a determinant?

Yes, its description mentions addition, multiplication and determinant. You can therefore use it to check a matrix before continuing an exercise. For a system, 2x2 Linear System remains more direct.

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