Chapter 10: Problem 100
Without showing all the details, explain how to simplify \(\sqrt[3]{16 x^{14}}\)
Short Answer
Expert verified
The simplified form of the expression \(\sqrt[3]{16x^{14}}\) is \(2^{4/3}x^3*\sqrt[3]{x^5}\).
Step by step solution
01
Rewrite the term with exponent
Rewrite the 16 as \(2^4\) and \(x^{14}\) as \(x^{9}\) times \(x^{5}\). So the expression inside becomes \(2^4x^{9}x^{5}\).
02
Apply cube root for the terms inside
Apply the cube root for each term inside the radical. You will obtain \(\sqrt[3]{(2^4)}*\sqrt[3]{(x^{9})}*\sqrt[3]{(x^{5})}\).
03
Simplify each term
Using the properties of exponents \(\sqrt[n]{a^n} = a\), simplify \(\sqrt[3]{(2^4)}\), \(\sqrt[3]{(x^{9})}\) and \(\sqrt[3]{(x^{5})}\). For numbers which exponent is not divisible by three, you leave it as it is: \(2^{4/3} = \sqrt[3]{16}\), \(x^{9/3} = x^3\) and \(x^{5/3} = \sqrt[3]{x^5}\).
04
Combine the simplified terms
Combine the simplified terms to get the final result. So, the simplified form of the expression \(\sqrt[3]{16x^{14}}\) is \(2^{4/3}x^3*\sqrt[3]{x^5}\).
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Key Concepts
These are the key concepts you need to understand to accurately answer the question.
Exponents
Exponents are a way of expressing a number being multiplied by itself a certain number of times. When you encounter something like \(x^{14}\), it means that \(x\) is multiplied by itself 14 times in total. Exponents are helpful because they allow us to write long multiplication in a compact way.
For example:
For example:
- \(2^4 = 2 \times 2 \times 2 \times 2\)
- \(x^9 = x \times x \times x \times x \times x \times x \times x \times x \times x\)
Cube Roots
A cube root is an operation that finds a number which, when multiplied by itself three times, results in the original number. The cube root symbol is written as \(\sqrt[3]{\cdot}\). For example, the cube root of 8 is 2, because \(2 \times 2 \times 2 = 8\).
The cube root process can also be used with variables and exponents:
The cube root process can also be used with variables and exponents:
- \(\sqrt[3]{x^9} = x^{9/3} = x^3\)
- If the exponent is not directly divisible by 3, you'll be left with a fractional exponent.
Radicals
Radicals are symbols that indicate the root of a number, and they come in various forms—square roots \(\sqrt{\cdot}\), cube roots \(\sqrt[3]{\cdot}\), and so on. They help simplify expressions that involve powers and roots. When simplifying a radical expression, you break down the number or variable inside the radical into its factors.
For example, in \(\sqrt[3]{16x^{14}}\), breaking down 16 to \(2^4\) helps to handle the expression inside the radical. When dealing with radicals:
For example, in \(\sqrt[3]{16x^{14}}\), breaking down 16 to \(2^4\) helps to handle the expression inside the radical. When dealing with radicals:
- Identify if the exponent can be divided by the root order.
- Simplify using the properties of exponents.
Algebraic Expressions
Algebraic expressions are combinations of numbers, variables, and operations like addition, subtraction, and multiplication. They capture mathematical ideas in a compact form. In expressions, exponents, roots, and radicals are used to express repeated operations or to simplify expressions.
In simplifying expressions such as \(\sqrt[3]{16x^{14}}\), recognizing parts like \(16x^{14}\) can help identify what needs to be simplified through factorization and then applying cube root operations.
For example, breaking down the expression into smaller parts:
In simplifying expressions such as \(\sqrt[3]{16x^{14}}\), recognizing parts like \(16x^{14}\) can help identify what needs to be simplified through factorization and then applying cube root operations.
For example, breaking down the expression into smaller parts:
- \(16\) becomes \(2^4\)
- \(x^{14}\) can be split into bindable terms like \(x^9\) and \(x^5\)