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Cardano’s Formula Calculator

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The Cardano’s Formula Calculator helps users find the roots of cubic equations, which are equations of the form:

ax³ + bx² + cx + d = 0

This calculator is particularly useful in fields such as mathematics, engineering, and physics, allowing users to solve complex cubic equations quickly and efficiently without manual calculations.

Formula of Cardano’s Formula Calculator

Cardano’s formula is used to find the roots of a cubic equation by reducing it to a depressed cubic form. Here’s the process:

  1. Start with the cubic equation:ax³ + bx² + cx + d = 0
  2. Use the substitution:x = y – (b / 3a)This transforms the equation into:y³ + py + q = 0where:p = (3ac – b²) / (3a²)q = (2b³ – 9abc + 27a²d) / (27a³)
  3. The roots of the depressed cubic equation y³ + py + q = 0 can be calculated using the formulas:y₁ = C + Δ₀ / Cy₂ = ωC + Δ₀ / (ωC)y₃ = ω²C + Δ₀ / (ω²C)where:C = ³√(Δ₁ / 2 + √(Δ₁² / 4 – Δ₀³ / 27))Δ₀ = -p / 3Δ₁ = -q / 2ω = (-1 + √(-3)) / 2 (a non-real cube root of unity)
  4. Finally, substitute back to find the roots of the original cubic equation:x = y + (b / 3a)
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Common Terms for Cubic Equations

Here’s a table of common terms related to cubic equations that may help users understand the calculations better:

TermDescription
CoefficientA number multiplying a variable (e.g., a, b, c, d)
RootA solution to the equation (the value of x)
DepressedA simplified form of a cubic equation
UnityA complex number used in calculations

Example of Cardano’s Formula Calculator

Let’s consider the cubic equation:

2x³ – 4x² + 3x – 6 = 0

Here, the coefficients are:

  • a = 2
  • b = -4
  • c = 3
  • d = -6

Using Cardano’s formula, we first calculate:

  1. p = (3 * 2 * 3 – (-4)²) / (3 * 2²) = (18 – 16) / 12 = 2/12 = 1/6
  2. q = (2 * (-4)³ – 9 * 2 * (-4) * (-6) + 27 * 2² * (-6)) / (27 * 2³)Calculating q yields q = -146 / 216 = -73 / 108.
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Now we proceed to calculate C and the roots y₁, y₂, and y₃ using the given formulas.

Most Common FAQs

What is Cardano’s Formula?

Cardano’s formula is a method for finding the roots of cubic equations. It simplifies the process of solving complex polynomial equations.

How do I use the Cardano’s Formula Calculator?

To use the calculator, enter the coefficients a, b, c, and d of your cubic equation, and click calculate. The calculator will provide you with the roots of the equation.

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