Chapter 6: Problem 7
Simplify and reduce each expression. $$ \frac{-10 \pm \sqrt{75}}{10} $$
Short Answer
Expert verified
The simplified expressions are \(-1 + \frac{1}{2}\sqrt{3}\) and \(-1 - \frac{1}{2}\sqrt{3}\).
Step by step solution
01
Examine the Expression
The expression given is \( \frac{-10 \pm \sqrt{75}}{10} \). We need to simplify this expression by first breaking down the components within it. The plus-minus sign suggests that there are two possible expressions.
02
Simplify the Radical
Notice that \( \sqrt{75} \) can be simplified. \( 75 = 25 \times 3 \), so \( \sqrt{75} = \sqrt{25 \times 3} = \sqrt{25} \times \sqrt{3} = 5 \sqrt{3} \). Replace \( \sqrt{75} \) with \( 5 \sqrt{3} \) in the expression.
03
Split the Expression
The expression \( \frac{-10 \pm 5\sqrt{3}}{10} \) is equivalent to two expressions: \( \frac{-10 + 5\sqrt{3}}{10} \) and \( \frac{-10 - 5\sqrt{3}}{10} \). Let's handle each separately.
04
Simplify the First Expression
For \( \frac{-10 + 5\sqrt{3}}{10} \), divide both terms in the numerator by the denominator: \( \frac{-10}{10} + \frac{5\sqrt{3}}{10} = -1 + \frac{1}{2}\sqrt{3} \).
05
Simplify the Second Expression
For \( \frac{-10 - 5\sqrt{3}}{10} \), similarly divide both terms in the numerator by the denominator: \( \frac{-10}{10} - \frac{5\sqrt{3}}{10} = -1 - \frac{1}{2}\sqrt{3} \).
06
Write the Simplified Expressions
The simplified forms of the original expression are \( -1 + \frac{1}{2}\sqrt{3} \) and \( -1 - \frac{1}{2}\sqrt{3} \).
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Key Concepts
These are the key concepts you need to understand to accurately answer the question.
Radical Simplification
Radical simplification involves breaking down a radical expression into its simplest form. In the given problem, we encountered the square root of 75: \( \sqrt{75} \). To simplify, it helps to factor this number into its components.
75 can be divided into 25 and 3. Since 25 is a perfect square, it can be separated as \( 25 \times 3 \). Now, using the property \( \sqrt{a \times b} = \sqrt{a} \times \sqrt{b} \), the expression becomes \( \sqrt{25} \times \sqrt{3} \).
\( \sqrt{25} \) simplifies to 5, so the expression becomes \( 5\sqrt{3} \).
75 can be divided into 25 and 3. Since 25 is a perfect square, it can be separated as \( 25 \times 3 \). Now, using the property \( \sqrt{a \times b} = \sqrt{a} \times \sqrt{b} \), the expression becomes \( \sqrt{25} \times \sqrt{3} \).
\( \sqrt{25} \) simplifies to 5, so the expression becomes \( 5\sqrt{3} \).
- The goal is to express radicals in terms of their simplest constituent parts.
- This makes algebraic manipulations easier and cleaner.
- Look for perfect squares within the radical for simplification.
Rational Expressions
A rational expression is a fraction that has polynomials in both its numerator and denominator. In our exercise, we see this when dealing with the expression \( \frac{-10 \pm 5\sqrt{3}}{10} \). The goal with rational expressions is to simplify them as much as possible.
First, split the expression in the numerator: \( -10 \pm 5\sqrt{3} \) becomes two separate expressions when considering the plus-minus operator. These separate into \( -10 + 5\sqrt{3} \) and \( -10 - 5\sqrt{3} \).
By simplifying each component separately, you arrive at:
First, split the expression in the numerator: \( -10 \pm 5\sqrt{3} \) becomes two separate expressions when considering the plus-minus operator. These separate into \( -10 + 5\sqrt{3} \) and \( -10 - 5\sqrt{3} \).
By simplifying each component separately, you arrive at:
- For \( \frac{-10 + 5\sqrt{3}}{10} \): \( \frac{-10}{10} + \frac{5\sqrt{3}}{10} = -1 + \frac{1}{2}\sqrt{3} \)
- For \( \frac{-10 - 5\sqrt{3}}{10} \): \( \frac{-10}{10} - \frac{5\sqrt{3}}{10} = -1 - \frac{1}{2}\sqrt{3} \)
Step-by-Step Algebra
Step-by-step algebra is about breaking down problems into manageable steps, tackling each one methodically. This approach ensures that even complex expressions become easy to handle.
Here’s a streamlined process, seen in our exercise:
1. **Examine the expression**: Begin by carefully breaking down what the problem entails. In our case, splitting \( \frac{-10 \pm \sqrt{75}}{10} \) into potential solutions reveals two paths to consider.
2. **Simplify each component**: By simplifying radicals (converting \( \sqrt{75} \) to \( 5\sqrt{3} \)), we make future steps much simpler. Always try to perform simplifications in the earliest steps.
3. **Solve progressively**: Take each modified expression and simplify further. Both the rational expression simplifications in the exercise involved dividing each term by the denominator, reducing complexity.
4. **Verify your results**: Conclude by checking your simplified terms to ensure no errors were made and expressions are reduced as much as possible.
This systematic breakdown not only simplifies algebraic expressions but builds a strong foundation for solving larger problems.
In sum, always tackle algebra methodically, reducing complexity step by step.
Here’s a streamlined process, seen in our exercise:
1. **Examine the expression**: Begin by carefully breaking down what the problem entails. In our case, splitting \( \frac{-10 \pm \sqrt{75}}{10} \) into potential solutions reveals two paths to consider.
2. **Simplify each component**: By simplifying radicals (converting \( \sqrt{75} \) to \( 5\sqrt{3} \)), we make future steps much simpler. Always try to perform simplifications in the earliest steps.
3. **Solve progressively**: Take each modified expression and simplify further. Both the rational expression simplifications in the exercise involved dividing each term by the denominator, reducing complexity.
4. **Verify your results**: Conclude by checking your simplified terms to ensure no errors were made and expressions are reduced as much as possible.
This systematic breakdown not only simplifies algebraic expressions but builds a strong foundation for solving larger problems.
In sum, always tackle algebra methodically, reducing complexity step by step.