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Chapter 10: Problem 25

Use radical notation to rewrite each expression. Simplify if possible. $$ (7 x+2)^{2 / 3} $$

Short Answer

Expert verified
\(\sqrt[3]{(7x+2)^2}\), no further simplification is possible.

Step by step solution

01

Understand Radical Notation

Radical notation involves expressing expressions with fractional exponents as roots. The numerator of the exponent indicates the power, while the denominator indicates the root.
02

Rewrite with Radical Notation

The expression \((7x+2)^{2/3}\) can be rewritten using radical notation as:\[\sqrt[3]{(7x+2)^2}\] This means the cube root of \((7x+2)^2\).
03

Simplify if Possible

Since \((7x+2)^2\) does not produce a simple integer or polynomial under a cube root, we leave it as \(\sqrt[3]{(7x+2)^2}\). No further simplification is possible with algebraic expressions.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Fractional Exponents
Fractional exponents can seem a bit tricky at first, but they are simply a way to express roots. The idea is to use fractions in exponents to indicate not only the power of a number, but also its root. Let's break it down a bit:
  • The numerator of the fractional exponent is the power: it tells you how many times you multiply the base by itself.
  • The denominator is the root: it shows you what type of root you are dealing with, such as a square root (2) or a cube root (3).
For example, in an expression like \((7x+2)^{2/3}\), the numerator 2 means you square the expression, and the denominator 3 means you take the cube root of the result.
This type of notation is particularly useful because it allows complex expressions to be simplified and manipulated with ease in mathematical operations.
Roots and Radicals
Roots and radicals are fundamental concepts in mathematics, often appearing in algebra and calculus. A root is simply another way of expressing a fractional power, which we often write using radical notation.
The most common roots are the square root \(\sqrt{x}\) and cube root \(\sqrt[3]{x}\).Understanding roots requires grasping that:
  • The square root of a number is a value that, when multiplied by itself, gives the original number.
  • Cube roots involve finding a number which, when multiplied by itself three times, results in the original number.
Radical notation provides a visual and practical way to represent these operations. In our example, \(\sqrt[3]{(7x+2)^2}\) represents the cube root of \((7x+2)^2\).Keep in mind that while these expressions can often be simplfied when working with numbers, algebraic expressions under roots may remain as they are if they don't resolve to simple terms.
Simplifying Expressions
Simplifying expressions involves reducing complex expressions into simpler or more manageable forms. This is a basic skill in algebra that allows us to solve equations more easily by eliminating unnecessary complexity. There are a few core strategies to keep in mind when simplifying expressions:
  • Combine like terms: Look for terms that have the same variable parts and combine them.
  • Use distributive properties: Expand expressions where needed, such as \\(a(b+c) = ab + ac.\)
  • Factor expressions: Factor out common factors to simplify the expression, if possible.
In some cases, expressions involving radicals may not simplify to a neat integer or polynomial form, especially if they involve variables. For instance, in our example \(\sqrt[3]{(7x+2)^2}\), no further simplification is possible without additional information about \x\.It is essential to recognize when an expression is as simplified as it can be, to avoid unnecessary computations."

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Most popular questions from this chapter

The maximum distance \(D(h)\) in kilometers that a person can see from a height h kilometers above the ground is given by the function \(D(h)=111.7 \sqrt{h}\). Round your answers to two decimal places. Find the height that would allow a person to see 40 kilometers.

Rationalize each numerator. Assume that all variables represent positive real numbers. \(\sqrt{\frac{12}{7}}\)

Solve. $$ \sqrt{x-2}+3=\sqrt{4 x+1} $$

Determine the smallest number both the numerator and denominator should be multiplied by to rationalize the denominator of the radical expression. \(\frac{9}{\sqrt[3]{5}}\)

Solve. Give exact answers and two-decimal-place approximations where appropriate. A wire is needed to support a vertical pole 15 feet tall. The cable will be anchored to a stake 8 feet from the base of the pole. How much cable is needed?
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