Understanding the Square Root Equation

Oct 13, 2025 by windailys.com 42 views

Introduction

In mathematics, equations involving square roots can be challenging to solve. However, with a clear understanding of the properties of square roots and some simple algebraic manipulations, we can simplify these equations and find their solutions. In this article, we will explore the equation $\sqrt{x^2+81}=x+10$ and determine which of the given options is equivalent to it.

Understanding the Square Root Equation

The given equation is $\sqrt{x^2+81}=x+10$ . To simplify this equation, we need to eliminate the square root. We can do this by squaring both sides of the equation. This will allow us to remove the square root and simplify the equation.

Squaring Both Sides of the Equation

When we square both sides of the equation, we get:

\left(\sqrt{x^2+81}\right)^2=(x+10)^2

Using the property of exponents that $(a^m)^n=a^{mn}$ , we can simplify the left-hand side of the equation:

x^2+81=x^2+20x+100

Simplifying the Equation

Now that we have squared both sides of the equation, we can simplify it further. We can start by subtracting $x^2$ from both sides of the equation:

81=20x+100

Next, we can subtract 100 from both sides of the equation:

-19=20x

Finally, we can divide both sides of the equation by 20:

x=-\frac{19}{20}

Evaluating the Options

Now that we have simplified the equation, we can evaluate the given options to determine which one is equivalent to the original equation.

Option A: $x+9=x+10$

This option is not equivalent to the original equation. We can see that the left-hand side of the equation is $x+9$ , while the right-hand side is $x+10$ . These two expressions are not equal, so this option is not a solution to the original equation.

Option B: $x+9=x^2+20x+100$

This option is not equivalent to the original equation. We can see that the left-hand side of the equation is $x+9$ , while the right-hand side is $x^2+20x+100$ . These two expressions are not equal, so this option is not a solution to the original equation.

Option C: $x^2+81=x^2+100$

This option is not equivalent to the original equation. We can see that the left-hand side of the equation is $x^2+81$ , while the right-hand side is $x^2+100$ . These two expressions are not equal, so this option is not a solution to the original equation.

Option D: $x^2+81=x^2+20x+100$

This option is equivalent to the original equation. We can see that the left-hand side of the equation is $x^2+81$ , while the right-hand side is $x^2+20x+100$ . These two expressions are equal, so this option is a solution to the original equation.

Conclusion

In this article, we have explored the equation $\sqrt{x^2+81}=x+10$ and determined which of the given options is equivalent to it. We have shown that the correct option is $x^2+81=x^2+20x+100$ . This option is equivalent to the original equation, and it can be used to solve the equation. We hope that this article has provided a clear and concise explanation of how to solve the square root equation and has helped readers to understand the properties of square roots.

Final Answer

The final answer is:

Option D: $x^2+81=x^2+20x+100$

Q: What is a square root equation?

A: A square root equation is an equation that involves a square root. It is an equation that contains a variable or expression inside a square root symbol.

Q: How do I simplify a square root equation?

A: To simplify a square root equation, you need to eliminate the square root. You can do this by squaring both sides of the equation. This will allow you to remove the square root and simplify the equation.

Q: What is the property of exponents that I need to use when squaring both sides of the equation?

A: The property of exponents that you need to use when squaring both sides of the equation is $(a^m)^n=a^{mn}$ . This property allows you to simplify the left-hand side of the equation when you square both sides.

Q: How do I simplify the equation after squaring both sides?

A: After squaring both sides of the equation, you can simplify it further by subtracting the same value from both sides of the equation. You can also add or subtract the same value from both sides of the equation to simplify it further.

Q: What is the final step in solving a square root equation?

A: The final step in solving a square root equation is to evaluate the options and determine which one is equivalent to the original equation.

Q: How do I evaluate the options?

A: To evaluate the options, you need to compare the left-hand side of the equation with the right-hand side of the equation. If the two expressions are equal, then the option is a solution to the original equation.

Q: What is the most common mistake that people make when solving square root equations?

A: The most common mistake that people make when solving square root equations is not squaring both sides of the equation. This can lead to incorrect solutions and make it difficult to solve the equation.

Q: How can I avoid making this mistake?

A: To avoid making this mistake, you need to make sure that you square both sides of the equation. You can do this by using the property of exponents that $(a^m)^n=a^{mn}$ .

Q: What are some common applications of square root equations?

A: Square root equations have many common applications in mathematics and science. They are used to solve problems involving distance, rate, and time, as well as problems involving geometry and trigonometry.

Q: How can I practice solving square root equations?

A: You can practice solving square root equations by working through examples and exercises. You can also use online resources and practice tests to help you improve your skills.

Q: What are some tips for solving square root equations?

A: Some tips for solving square root equations include:

Make sure to square both sides of the equation.
Use the property of exponents that $(a^m)^n=a^{mn}$ .
Simplify the equation by subtracting the same value from both sides.
Evaluate the options and determine which one is equivalent to the original equation.

Conclusion

In this article, we have answered some frequently asked questions about solving square root equations. We have provided tips and examples to help you improve your skills and solve square root equations with confidence.

Final Answer

The final answer is:

Squaring both sides of the equation is the key to simplifying a square root equation.
Using the property of exponents that $(a^m)^n=a^{mn}$ is essential when squaring both sides of the equation.
Simplifying the equation by subtracting the same value from both sides is an important step in solving a square root equation.
Evaluating the options and determining which one is equivalent to the original equation is the final step in solving a square root equation.