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Algebra — Standardregeln und -formeln

Quadratisch

x=−b±Δ2a,Δ=b2−4acx = \frac{-b \pm \sqrt{\Delta}}{2a}, \quad \Delta = b^2 - 4ac

Δ > 0: 2 real roots | Δ = 0: 1 double root | Δ < 0: 2 complex roots

Cramersche Regel

x=DxD,y=DyD,z=DzDx = \frac{D_x}{D}, \quad y = \frac{D_y}{D}, \quad z = \frac{D_z}{D}

Solves simultaneous linear systems using matrix determinants.

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Ausdruck eingeben und Go drücken

Schritt-für-Schritt-Gleichungslösung

Algebraische Gleichungen drücken die Gleichheit zweier mathematischer Ausdrücke aus. Durch Äquivalenzumformungen bestimmen wir exakte Lösungen.

Linear

ax+b=0  ⟹  x=−baax + b = 0 \implies x = -\frac{b}{a}

First-degree equations with a unique real root, infinite solutions, or no solution.

Quadratisch

x=−b±b2−4ac2ax = \frac{-b \pm \sqrt{b^2 - 4ac}}{2a}

Second-degree equations analyzed via discriminant Δ for real or complex roots.

Cramersche Regel

xi=det⁡(Ai)det⁡(A)x_i = \frac{\det(A_i)}{\det(A)}

Solves simultaneous linear systems of 2 and 3 variables using matrix determinants.

Diskriminantenformel & Nature of Roots

Δ > 0 (Two Real Roots)

The parabola crosses the x-axis at two distinct real points.

x₁, x₂ ∈ ℝ, x₁ ≠ x₂

Δ = 0 (One Double Root)

The vertex of the parabola touches the x-axis at exactly one point.

x₀ = -b / (2a)

Δ < 0 (Complex Conjugates)

The curve does not cross the x-axis; roots are imaginary numbers.

x = u ± vi, i² = -1

Lineare Gleichungssysteme

A system of linear equations is a collection of two or more equations sharing the same set of variables. When solving a 2x2 system, each equation represents a straight line in the Cartesian plane. The solution corresponds to the geometric intersection point of the two lines:

Substitution & Elimination

{a1x+b1y=c1a2x+b2y=c2\begin{cases} a_1 x + b_1 y = c_1 \\ a_2 x + b_2 y = c_2 \end{cases}

Isolating one variable and substituting it into the remaining equations to reduce the dimensions systematically.

Determinants & Matrix Inverse

A⋅x=b  ⟹  x=A−1bA \cdot \mathbf{x} = \mathbf{b} \implies \mathbf{x} = A^{-1} \mathbf{b}

Expressing the linear relations compactly as a matrix equation and inverting the matrix when det(A) ≠ 0.

Häufig gestellte Fragen

How do you solve linear equations step by step?

To solve a linear equation ax + b = c, expand both sides, group all terms containing the variable on the left side, move constant terms to the right side, combine like terms, and divide both sides by the coefficient of x.

How does the discriminant formula work for quadratic equations?

For a quadratic equation ax² + bx + c = 0, the discriminant is Δ = b² - 4ac. If Δ > 0, there are two distinct real solutions; if Δ = 0, there is one double real root; and if Δ < 0, there are two complex conjugate roots involving the imaginary unit i.

What methods are used to solve systems of 2 and 3 equations?

Mathsway uses Cramer's Rule with matrix determinants (D, Dx, Dy, Dz) as well as Gaussian elimination and substitution, providing exact fractional values and step-by-step verification.

What happens when an equation has no solution or infinitely many solutions?

If simplifying an equation leads to a false statement (e.g. 0 = 5), the equation is inconsistent and has no solution (empty set ∅). If simplifying yields an identity (0 = 0), the equation is dependent and has infinitely many solutions (all real numbers ℝ).

Can this equation solver calculate complex or imaginary numbers?

Yes. When a quadratic equation has a negative discriminant (Δ < 0), the calculator displays the exact complex conjugate solutions in the form u ± vi.

Is this equation solver free and private?

Yes, it is 100% free with no signup or login required. All calculations run client-side in your browser using Web Workers, ensuring complete privacy.