6^2 = 20 + 2xy \implies 36 = 20 + 2xy \implies 2xy = 16 \implies xy = 8 - Parker Core Knowledge
Understanding the Powerful Algebraic Identity: 6² = 20 + 2xy Implies xy = 8
Understanding the Powerful Algebraic Identity: 6² = 20 + 2xy Implies xy = 8
Mathematics is full of elegant identities that reveal deep connections between numbers. One such revelation comes from manipulating a simple but powerful equation:
6² = 20 + 2xy
Understanding the Context
At first glance, this equation may seem straightforward, but it unlocks elegant simplifications that can streamline problem-solving in algebra, geometry, and number theory. Let’s break it down step by step and uncover why this identity holds true—and how it leads to meaningful results like xy = 8.
The Starting Point: Squaring 6
The equation begins with:
6² = 36
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Key Insights
On the right-hand side, we see:
20 + 2xy
So, rewriting the equation:
36 = 20 + 2xy
This sets the stage for substitution and simplification.
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Solving Step by Step
To isolate the product term xy, follow these algebraic steps:
-
Subtract 20 from both sides to eliminate the constant:
36 – 20 = 2xy
→ 16 = 2xy -
Divide both sides by 2 to solve for xy:
16 ÷ 2 = xy
→ xy = 8
What Does This Identity Mean?
While this equation arises from specific values, it exemplifies a broader principle: distributing multiplication over addition in completing the square and simplifying quadratic expressions. In this case, recognizing that 6² and 20 stem from geometric relationships (e.g., areas or coordinate constructions) can offer insight into why such identities exist.
For example, suppose you're working with a rectangle where one side is 6 and the product of its sides (xy) relates indirectly via an expression like 2xy = 16. This old identity helps verify or simplify such geometric or algebraic setups.
