$ (8a + 4b + 2c + d) - (a + b + c + d) = -1 - 3 $ - Coaching Toolbox
Understanding the Simplified Equation: $ (8a + 4b + 2c + d) - (a + b + c + d) = -3 $
Understanding the Simplified Equation: $ (8a + 4b + 2c + d) - (a + b + c + d) = -3 $
In algebra, simplifying expressions helps clarify hidden relationships and solve equations more effectively. One such expression commonly encountered is:
$$
(8a + 4b + 2c + d) - (a + b + c + d) = -3
$$
Understanding the Context
At first glance, the operation involves subtracting two polynomial expressions, but through step-by-step simplification, we uncover its true value and meaning.
Step-by-Step Simplification
Start with the original equation:
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Key Insights
$$
(8a + 4b + 2c + d) - (a + b + c + d)
$$
Remove the parentheses by distributing the negative sign:
$$
8a + 4b + 2c + d - a - b - c - d
$$
Now combine like terms:
- For $a$: $8a - a = 7a$
- For $b$: $4b - b = 3b$
- For $c$: $2c - c = c$
- For $d$: $d - d = 0$
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So the simplified expression is:
$$
7a + 3b + c
$$
Thus, the equation becomes:
$$
7a + 3b + c = -3
$$
What Does This Mean?
The simplified equation shows a linear relationship among variables $a$, $b$, and $c$. While $d$ cancels out and does not affect the result, the final form reveals a constraint: the weighted sum $7a + 3b + c = -3$ must hold true.
This type of simplification is valuable in various applications, including:
- Systems of equations — reducing complexity to isolate variables.
- Optimization problems — identifying constraints in linear programming.
- Algebraic reasoning — revealing underlying structure through elimination of redundant terms.
