Chapter 5: Problem 61
Write a perfect square trinomial equation in which the linear coefficient is negative and the constant term is a fraction. Then solve the equation.
Short Answer
Expert verified
The solution is \(x = \frac{1}{2}\).
Step by step solution
01
Choose Variables
Let's select a variable for our trinomial equation. We'll use \(x\).
02
Formulate the Expression
We will create a perfect square trinomial in the form of \((a - b)^2\). In a perfect square trinomial, it expands to \(a^2 - 2ab + b^2\). Here, we choose \(a = x\) and \(b = \frac{1}{2}\).
03
Write the Equation
Substitute \(b = \frac{1}{2}\) into the expanded form to get: \[ x^2 - 2\left(x\right)\left(\frac{1}{2}\right) + \left(\frac{1}{2}\right)^2 = 0 \] Simplifying, it becomes: \[ x^2 - x + \frac{1}{4} = 0 \]
04
Solve the Equation by Factoring
This equation can be rewritten using the perfect square factor: \[ \left(x - \frac{1}{2}\right)^2 = 0 \] By factoring the perfect square, we find the roots of the equation.
05
Find the Solution
Set the factor equal to zero: \[ x - \frac{1}{2} = 0 \] Solving for \(x\) gives us: \[ x = \frac{1}{2} \]
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Key Concepts
These are the key concepts you need to understand to accurately answer the question.
Factoring Quadratic Equations
Factoring quadratic equations is a method used to solve second-degree polynomial equations. It involves rewriting the quadratic equation in a "factored form," which is a product of simpler expressions. The goal is to express the quadratic equation as a multiplication of two binomials. For quadratics, they are usually in the form of \[ ax^2 + bx + c = 0 \]
**Identifying factorable quadratics:**
To determine if a quadratic can be factored:
This is a perfect square trinomial, allowing us to easily factor it.
**Identifying factorable quadratics:**
To determine if a quadratic can be factored:
- Look for two numbers that multiply to give you \( ac \) (where \( a \) is the coefficient of \( x^2 \), and \( c \) is the constant term)
- These numbers should also add up to give you \( b \) (the coefficient of \( x \))
This is a perfect square trinomial, allowing us to easily factor it.
Solving Equations
Solving equations means finding the values of the variable that make the equation true. After factoring a quadratic equation, the next step is solving it by setting each factor equal to zero. This involves applying the Zero Product Property, which states that if a product of factors is zero, at least one of the factors must be zero.
**Steps to solve:**
1. Once you have the factored form of the equation, set each factor equal to zero. - For example, from \( (x - \frac{1}{2})^2 = 0 \), you have the factor \( x - \frac{1}{2} \).2. Solve the resulting simple equation for the variable. - Setting \( x - \frac{1}{2} = 0 \) leads to solving \( x = \frac{1}{2} \).
This means the solution to the equation is \( x = \frac{1}{2} \). Once solved, check the solution by plugging it back into the original equation to verify it fulfills the equation.
**Steps to solve:**
1. Once you have the factored form of the equation, set each factor equal to zero. - For example, from \( (x - \frac{1}{2})^2 = 0 \), you have the factor \( x - \frac{1}{2} \).2. Solve the resulting simple equation for the variable. - Setting \( x - \frac{1}{2} = 0 \) leads to solving \( x = \frac{1}{2} \).
This means the solution to the equation is \( x = \frac{1}{2} \). Once solved, check the solution by plugging it back into the original equation to verify it fulfills the equation.
Perfect Squares
A perfect square trinomial is one that can be expressed as the square of a binomial. The standard forms are given as:- \( (a + b)^2 = a^2 + 2ab + b^2 \)- \( (a - b)^2 = a^2 - 2ab + b^2 \)
In forming a perfect square trinomial, it helps to recognize the pattern:
This way of factoring makes solving the equation straightforward by recognizing it as a perfect square.
In forming a perfect square trinomial, it helps to recognize the pattern:
- The first term is a perfect square \( (a^2) \).
- The coefficient of the middle term is twice the product of \( a \) and \( b \): \( 2ab \).
- The last term is also a perfect square \( (b^2) \).
This way of factoring makes solving the equation straightforward by recognizing it as a perfect square.