10^2 = 58 + 2ab \implies 100 = 58 + 2ab \implies 2ab = 42 \implies ab = 21

Unlocking the Mystery of 10² = 58 + 2ab: Solving for ab = 21

Mathematics is full of elegant equations that reveal deeper truths through logical manipulation. One such intriguing identity is:

10² = 58 + 2ab

Understanding the Context

While at first glance the equation may seem cryptic, breaking it down step-by-step unlocks a concise solution with value far beyond simple arithmetic. Let’s explore this algebraic mystery and discover how ab = 21 emerges naturally from the algebra.

The Original Equation: A Gateway to Insight

Start with the foundational statement:
10² = 58 + 2ab

$10^2 = 58 + 2ab \implies 100 = 58 + 2ab \implies 2ab = 42 \implies ab = 21$

Key Insights

We know 10² = 100, so substitute:
100 = 58 + 2ab

This transformation replaces variables with concrete numbers, simplifying the expression for immediate solving.

Step-by-Step Solving to ab = 21

To solve for ab, isolate the term containing the product:

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Final Thoughts

Step 1: Subtract 58 from both sides
100 – 58 = 2ab
→ 42 = 2ab

Step 2: Divide both sides by 2
42 ÷ 2 = ab
→ ab = 21

Why This Equation Matters

On the surface, this equation resembles simple algebra, but it highlights how changing or interpreting constants can lead to meaningful results. The choice of 10² (a perfect square) ties the identity to number theory, while 2ab suggests a symmetric product often linked in geometric constructions—such as area problems involving two unknowns, a and b.

Real-World Applications

Equations of this form appear in:

Algebraic word problems where the product of two variables (e.g., dimensions, rates) contributes to a fixed total.
Geometry involving rectangles or areas where one side (10) relates to a known dimension, and the product ab = 21 represents an unknown pairing summing idea with product.
Cryptographic puzzles and educational exercises designed to teach factoring and transformation.