Properties of Cube Roots and Exponents

Oct 13, 2025 by windailys.com 72 views

Understanding the Problem

The given problem involves simplifying a mathematical expression that includes the multiplication of two cube roots. The expression is $\sqrt[3]{16 x^7} \cdot \sqrt[3]{12 x^9}$ . To simplify this expression, we need to apply the properties of cube roots and exponents.

Properties of Cube Roots and Exponents

Before we proceed with the simplification, let's recall some important properties of cube roots and exponents:

The cube root of a number is a value that, when multiplied by itself twice, gives the original number. In mathematical notation, this is represented as $\sqrt[3]{a} = b$ if and only if $b^3 = a$ .
When multiplying two cube roots, we can combine them into a single cube root by multiplying the numbers inside the cube roots. In mathematical notation, this is represented as $\sqrt[3]{a} \cdot \sqrt[3]{b} = \sqrt[3]{ab}$ .
When simplifying expressions with exponents, we can combine like terms by adding the exponents. In mathematical notation, this is represented as $a^m \cdot a^n = a^{m+n}$ .

Simplifying the Expression

Now that we have reviewed the properties of cube roots and exponents, let's apply them to simplify the given expression:

$\sqrt[3]{16 x^7} \cdot \sqrt[3]{12 x^9}$

Using the property of multiplying two cube roots, we can combine them into a single cube root:

$\sqrt[3]{16 x^7 \cdot 12 x^9}$

Next, we can simplify the expression inside the cube root by multiplying the numbers and adding the exponents:

$\sqrt[3]{16 \cdot 12 \cdot x^7 \cdot x^9}$

$\sqrt[3]{192 x^{16}}$

Evaluating the Options

Now that we have simplified the expression, let's evaluate the options:

A. $x^2\left(\sqrt[3]{28 x^2}\right)$

B. $x^5(\sqrt[3]{28 x})$

C. $4 x^2\left(\sqrt[3]{3 x^2}\right)$

D. $4 x^5(\sqrt[3]{3 x})$

Comparing the simplified expression with the options, we can see that the correct answer is:

C. $4 x^2\left(\sqrt[3]{3 x^2}\right)$

This is because the simplified expression $\sqrt[3]{192 x^{16}}$ can be rewritten as $4 x^2\left(\sqrt[3]{3 x^2}\right)$ .

Conclusion

In conclusion, the correct answer to the given problem is C. $4 x^2\left(\sqrt[3]{3 x^2}\right)$ . This is because the simplified expression $\sqrt[3]{192 x^{16}}$ can be rewritten as $4 x^2\left(\sqrt[3]{3 x^2}\right)$ . The properties of cube roots and exponents were applied to simplify the expression, and the correct answer was evaluated by comparing the simplified expression with the options.

Q: What is the difference between a cube root and a square root?

A: A cube root is a value that, when multiplied by itself twice, gives the original number. In mathematical notation, this is represented as $\sqrt[3]{a} = b$ if and only if $b^3 = a$ . A square root, on the other hand, is a value that, when multiplied by itself, gives the original number. In mathematical notation, this is represented as $\sqrt{a} = b$ if and only if $b^2 = a$ .

Q: How do I simplify an expression with a cube root?

A: To simplify an expression with a cube root, you can apply the following steps:

Multiply the numbers inside the cube root.
Add the exponents of the variables inside the cube root.
Simplify the resulting expression.

Q: What is the property of multiplying two cube roots?

A: The property of multiplying two cube roots states that $\sqrt[3]{a} \cdot \sqrt[3]{b} = \sqrt[3]{ab}$ . This means that when you multiply two cube roots, you can combine them into a single cube root by multiplying the numbers inside the cube roots.

Q: How do I simplify an expression with multiple cube roots?

A: To simplify an expression with multiple cube roots, you can apply the following steps:

Multiply the numbers inside each cube root.
Add the exponents of the variables inside each cube root.
Simplify the resulting expression.

Q: What is the difference between a cube root and an exponent?

A: A cube root is a value that, when multiplied by itself twice, gives the original number. An exponent, on the other hand, is a value that represents repeated multiplication. For example, $x^3$ represents $x$ multiplied by itself three times.

Q: How do I simplify an expression with a cube root and an exponent?

A: To simplify an expression with a cube root and an exponent, you can apply the following steps:

Simplify the cube root by multiplying the numbers inside the cube root.
Simplify the exponent by adding the exponents of the variables.
Simplify the resulting expression.

Q: What is the property of combining like terms with exponents?

A: The property of combining like terms with exponents states that $a^m \cdot a^n = a^{m+n}$ . This means that when you multiply two terms with the same base and exponent, you can combine them into a single term by adding the exponents.

Q: How do I simplify an expression with multiple exponents?

A: To simplify an expression with multiple exponents, you can apply the following steps:

Simplify each exponent by adding the exponents of the variables.
Simplify the resulting expression.

Q: What is the difference between a positive exponent and a negative exponent?

A: A positive exponent represents repeated multiplication, while a negative exponent represents repeated division. For example, $x^3$ represents $x$ multiplied by itself three times, while $x^{-3}$ represents $x$ divided by itself three times.

Q: How do I simplify an expression with a positive exponent and a negative exponent?

A: To simplify an expression with a positive exponent and a negative exponent, you can apply the following steps:

Simplify the positive exponent by multiplying the numbers inside the exponent.
Simplify the negative exponent by dividing the numbers inside the exponent.
Simplify the resulting expression.

Q: What is the property of simplifying expressions with fractions?

A: The property of simplifying expressions with fractions states that you can simplify a fraction by dividing the numerator and denominator by their greatest common divisor (GCD). For example, $\frac{6}{8}$ can be simplified to $\frac{3}{4}$ by dividing both the numerator and denominator by 2.

Q: How do I simplify an expression with multiple fractions?

A: To simplify an expression with multiple fractions, you can apply the following steps:

Simplify each fraction by dividing the numerator and denominator by their GCD.
Simplify the resulting expression.

Q: What is the difference between a rational number and an irrational number?

A: A rational number is a number that can be expressed as a fraction, while an irrational number is a number that cannot be expressed as a fraction. For example, $\frac{1}{2}$ is a rational number, while $\sqrt{2}$ is an irrational number.

Q: How do I simplify an expression with a rational number and an irrational number?

A: To simplify an expression with a rational number and an irrational number, you can apply the following steps:

Simplify the rational number by dividing the numerator and denominator by their GCD.
Simplify the irrational number by leaving it in its original form.
Simplify the resulting expression.

Q: What is the property of simplifying expressions with absolute values?

A: The property of simplifying expressions with absolute values states that you can simplify an expression with absolute values by removing the absolute value sign and simplifying the expression inside. For example, $|x| = x$ if $x \geq 0$ , and $|x| = -x$ if $x < 0$ .

Q: How do I simplify an expression with multiple absolute values?

A: To simplify an expression with multiple absolute values, you can apply the following steps:

Simplify each absolute value by removing the absolute value sign and simplifying the expression inside.
Simplify the resulting expression.

Q: What is the difference between a linear equation and a quadratic equation?

A: A linear equation is an equation with one variable and a degree of 1, while a quadratic equation is an equation with one variable and a degree of 2. For example, $x + 2 = 3$ is a linear equation, while $x^2 + 4x + 4 = 0$ is a quadratic equation.

Q: How do I simplify an expression with a linear equation and a quadratic equation?

A: To simplify an expression with a linear equation and a quadratic equation, you can apply the following steps:

Simplify the linear equation by solving for the variable.
Simplify the quadratic equation by factoring or using the quadratic formula.
Simplify the resulting expression.

Q: What is the property of simplifying expressions with inequalities?

A: The property of simplifying expressions with inequalities states that you can simplify an inequality by adding or subtracting the same value to both sides of the inequality. For example, $x + 2 > 3$ can be simplified to $x > 1$ by subtracting 2 from both sides of the inequality.

Q: How do I simplify an expression with multiple inequalities?

A: To simplify an expression with multiple inequalities, you can apply the following steps:

Simplify each inequality by adding or subtracting the same value to both sides of the inequality.
Simplify the resulting expression.

Q: What is the difference between a system of linear equations and a system of quadratic equations?

A: A system of linear equations is a set of two or more linear equations with the same variables, while a system of quadratic equations is a set of two or more quadratic equations with the same variables. For example, $x + 2y = 3$ and $2x - 3y = 1$ is a system of linear equations, while $x^2 + 4x + 4 = 0$ and $x^2 - 2x + 1 = 0$ is a system of quadratic equations.

Q: How do I simplify an expression with a system of linear equations and a system of quadratic equations?

A: To simplify an expression with a system of linear equations and a system of quadratic equations, you can apply the following steps:

Simplify the system of linear equations by solving for the variables.
Simplify the system of quadratic equations by factoring or using the quadratic formula.
Simplify the resulting expression.

Q: What is the property of simplifying expressions with functions?

A: The property of simplifying expressions with functions states that you can simplify a function by combining like terms and simplifying the resulting expression. For example, $f(x) = 2x + 3$ can be simplified to $f(x) = 2x + 3$ by combining like terms.

Q: How do I simplify an expression with multiple functions?

A: To simplify an expression with multiple functions, you can apply the following steps:

Simplify each function by combining like terms and simplifying the resulting expression.
Simplify the resulting expression.

Q: What is the difference between a continuous function and a discontinuous function?

A: A continuous function is a function that can be graphed without lifting the pencil from the paper, while a discontinuous function is a function that cannot be graphed without lifting the pencil from the paper. For example, $f(x) = x^2$ is a continuous function, while $f(x) = \frac{1}{x}$ is a discontinuous function.

Q: How do I simplify an expression with a continuous function and a discontinuous function?

A: To simplify an expression with a continuous function and a discontinuous function, you can apply the following steps:

Simplify the continuous function by combining like terms and simplifying the resulting expression.
Simplify the discontinuous function by leaving it in