Chapter 10: Problem 48
Multiply, and then simplify if possible. \(\sqrt{5}(\sqrt{15}-\sqrt{35})\)
Short Answer
Expert verified
The expression simplifies to \( 5(\sqrt{3} - \sqrt{7}) \).
Step by step solution
01
Distribute the Radical
Start by distributing the \( \sqrt{5} \) to each term inside the parentheses: \[ \sqrt{5} \times \sqrt{15} - \sqrt{5} \times \sqrt{35} \]
02
Simplify Each Product of Radicals
Apply the property \( \sqrt{a} \times \sqrt{b} = \sqrt{ab} \) to each expression: - For \( \sqrt{5} \times \sqrt{15} \), you get \( \sqrt{75} \). - For \( \sqrt{5} \times \sqrt{35} \), you get \( \sqrt{175} \). Thus, the expression becomes: \[ \sqrt{75} - \sqrt{175} \]
03
Simplify Each Radical Expression
Break down each radical into simpler terms: - \( \sqrt{75} \) can be simplified to \( \sqrt{25 \times 3} = 5\sqrt{3} \). - \( \sqrt{175} \) can be simplified to \( \sqrt{25 \times 7} = 5\sqrt{7} \). This results in the expression: \[ 5\sqrt{3} - 5\sqrt{7} \]
04
Factor Out the Common Factor
Observe that both terms have a common factor of \( 5 \). This allows us to factor out \( 5 \), giving: \[ 5(\sqrt{3} - \sqrt{7}) \]
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Key Concepts
These are the key concepts you need to understand to accurately answer the question.
Simplifying Radicals
Simplifying radicals is the process of expressing a radical in its simplest form. It often involves breaking down the number inside the square root into factors. This helps to simplify calculations and provide a clearer expression. When simplifying a radical, look for perfect square factors. These are numbers like 4, 9, 16, etc., that have exact square roots.
- For instance, with \( \sqrt{75} \), recognize that 75 can be broken down into the factors 25 (a perfect square) and 3. Thus, \( \sqrt{75} = \sqrt{25 \times 3} = \sqrt{25} \cdot \sqrt{3} = 5\sqrt{3} \).
- Similarly, for \( \sqrt{175} \), notice that it can be simplified as \( \sqrt{25 \times 7} = \sqrt{25} \cdot \sqrt{7} = 5\sqrt{7} \).
Distributive Property
The distributive property is a vital concept in mathematics, especially when dealing with expressions involving parentheses. It states that multiplying a single term by each term within a set of parentheses combines the distributed pieces. In formula terms, this can be written as:\[ a(b+c) = ab + ac \]In the context of radicals, distributing can help simplify expressions by making multiplication more straightforward Take the example \( \sqrt{5}(\sqrt{15} - \sqrt{35}) \). You distribute \( \sqrt{5} \) to both \( \sqrt{15} \) and \( \sqrt{35} \), resulting in:
- \( \sqrt{5} \times \sqrt{15} = \sqrt{75} \)
- \( \sqrt{5} \times \sqrt{35} = \sqrt{175} \)
Radical Expressions
Radical expressions involve roots, typically square roots, and are an essential part of algebra. They consist of a radical symbol (√) and a radicand, the number inside the symbol. These expressions can sometimes appear daunting, but with the right approach, they can be managed easily.To begin simplifying radical expressions, remember these key points:
- The product of square roots can be combined: \( \sqrt{a} \times \sqrt{b} = \sqrt{ab} \).
- Always look for opportunities to simplify by recognizing perfect square factors within the radicand.