Chapter 7: Problem 4
Solve the given quadratic equations by using the square root property. $$x^{2}=100$$
Short Answer
Expert verified
The solutions are \(x = 10\) and \(x = -10\).
Step by step solution
01
Identifying the Equation
The given quadratic equation is \(x^2 = 100\). Our goal is to find the value of \(x\) by using the square root property.
02
Applying the Square Root Property
According to the square root property, if \(x^2 = c\), then \(x = \sqrt{c}\) or \(x = -\sqrt{c}\). We apply this to \(x^2 = 100\) to find \(x = \sqrt{100}\) or \(x = -\sqrt{100}\).
03
Calculating the Square Roots
Calculate the positive and negative square roots of \(100\): \(\sqrt{100} = 10\), so the solutions are \(x = 10\) and \(x = -10\).
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Key Concepts
These are the key concepts you need to understand to accurately answer the question.
Square Root Property
The square root property is a handy tool used in solving quadratic equations of the form \(x^2 = c\). This property helps us find the values of \(x\) that satisfy the equation. Simply put, whenever you have \(x^2 = c\), you can directly use this property to state that \(x = \sqrt{c}\) or \(x = -\sqrt{c}\).
This direct approach helps you solve problems without needing to rearrange equations much. It relies on understanding that squaring any real number results in a positive value. That's why we consider both positive and negative roots:
This direct approach helps you solve problems without needing to rearrange equations much. It relies on understanding that squaring any real number results in a positive value. That's why we consider both positive and negative roots:
- \(x = \sqrt{c}\)
- \(x = -\sqrt{c}\)
Quadratic Formula
The quadratic formula is a versatile method used for finding solutions to any quadratic equation, which is typically written in standard form as \(ax^2 + bx + c = 0\). The formula is expressed as:\[x = \frac{-b \pm \sqrt{b^2 - 4ac}}{2a}\]
This formula can effectively yield solutions for every type of quadratic equation, including those where the square root property isn't applicable directly. Although the equation in our exercise \(x^2 = 100\) doesn't require the quadratic formula due to its simplicity, understanding this method is still valuable, especially in more complex scenarios.Here's why the quadratic formula is so crucial:
This formula can effectively yield solutions for every type of quadratic equation, including those where the square root property isn't applicable directly. Although the equation in our exercise \(x^2 = 100\) doesn't require the quadratic formula due to its simplicity, understanding this method is still valuable, especially in more complex scenarios.Here's why the quadratic formula is so crucial:
- It works for any quadratic equation, regardless of coefficients.
- The discriminant \(b^2 - 4ac\) inside the square root can tell you the nature of the roots.
- It systematically gives the roots without having to factor or complete the square.
Mathematical Problem-Solving
Problem-solving in mathematics goes beyond manipulation of numbers and includes logical reasoning, identifying patterns, and applying theoretical knowledge. Solving quadratic equations often tests these skills, requiring a blend of simple arithmetic, understanding properties like square roots, and employing formulas when necessary.
Here are some strategies for solving mathematical problems like quadratic equations:
Here are some strategies for solving mathematical problems like quadratic equations:
- Analyze the equation: Identify if it's suitable for the square root property or if it needs the quadratic formula.
- Simplify the problem: Break it down into smaller, manageable steps.
- Double-check results: Make sure to verify the correctness of solutions by substituting back into the original equation.
Basic Algebra Concepts
To tackle quadratic equations effectively, a foundation in basic algebra concepts is essential. These foundational skills include understanding variables, exponents, and operations such as addition, subtraction, multiplication, and division. When solving equations like \(x^2 = 100\), you need to be comfortable manipulating and interpreting such expressions.
Key algebra concepts relevant to quadratic equations include:
Key algebra concepts relevant to quadratic equations include:
- Variables: Symbols used to represent unknown numbers, like \(x\).
- Exponents: Express numbers raised to a power, as in \(x^2\).
- Operations: Core arithmetic skills to rearrange and simplify equations.