Understanding the Equation: x² + (y - 1)² + z² – [(x - 1)² + y² + z²] = 0

The equation
x² + (y - 1)² + z² – [(x - 1)² + y² + z²] = 0
might look complex at first glance, but it represents a meaningful geometric relationship in three-dimensional space. This article breaks down the equation, simplifies it, explores its geometric interpretation, and explains its relevance in applied mathematics and problem-solving.


Understanding the Context

Simplifying the Equation

Start with:
x² + (y - 1)² + z² – [(x - 1)² + y² + z²] = 0

First, expand each term carefully:

  1. Expand (y - 1)²:
    (y - 1)² = y² - 2y + 1
    So, x² + y² - 2y + 1 + z²

Key Insights

  1. Expand (x - 1)²:
    (x - 1)² = x² - 2x + 1
    So, (x² - 2x + 1) + y² + z²

Now substitute both into the original expression:

\[
[x² + y² - 2y + 1 + z²] - [x² - 2x + 1 + y² + z²] = 0
\]

Distribute the minus sign:

\[
x² + y² - 2y + 1 + z² - x² + 2x - 1 - y² - z² = 0
\]

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Final Thoughts

Now combine like terms:

  • \(x² - x² = 0\)
    - \(y² - y² = 0\)
    - \(z² - z² = 0\)
    - \(-2y + 2x + 1 - 1 = 2x - 2y\)

So the simplified equation is:
2x - 2y = 0
which further reduces to:
x – y = 0
or equivalently:
x = y


Geometric Interpretation

The simplified equation x = y describes a plane in three-dimensional space where the x-coordinate equals the y-coordinate. This is a vertical plane that slices through all values of z, passing diagonally across the xy-plane along the line where x = y.

Visualize shifting the classic planes. Instead of aligning with coordinate axes, this plane cuts diagonally from the origin along where x equals y, forming a “square-like” diagonal across quadrants where x and y are equal in magnitude and sign.

This plane is fundamental in symmetry considerations and acts as a decision boundary in optimization, machine learning, and physics problems involving diagonal variation or equilibrium.


Applications and Relevance