Chapter 0: Problem 12
Solve the following equations: $$ \left(x^{2}+1\right) \sqrt[3]{(x+1)^{4}}-\sqrt[3]{(x+1)^{7}}=0 $$
Short Answer
Expert verified
The short answer to the given equation is: \[x=-1, x=0, x=1\]
Step by step solution
01
Identify the common factor
In the given equation, we can observe that both terms have a common factor of \(\sqrt[3]{(x+1)^4}\). So, we can factor out this common factor.
02
Factor out the common factor
Factor out \(\sqrt[3]{(x+1)^4}\) from both terms:
\[
\sqrt[3]{(x+1)^4}\left((x^2+1)-\sqrt[3]{(x+1)^3}\right)=0
\]
03
Simplify the equation
Simplify the expression inside the parentheses:
\[
\sqrt[3]{(x+1)^4}\left(x^2+1-(x+1)\right)=0
\]
04
Solve for x using the zero-product property
According to the zero-product property, if the product of two factors is equal to zero, then at least one of the factors must be equal to zero. So, we have two cases:
1. \(\sqrt[3]{(x+1)^4}=0\)
2. \(x^2+1-(x+1)=0\)
05
Solve the first case
Solve for x in the equation \(\sqrt[3]{(x+1)^4}=0\):
\[
(x+1)^4 = 0
\]
Taking the fourth root on both sides, we get:
\[
x+1=0
\]
Solving for x, we get:
\[
x=-1
\]
06
Solve the second case
Solve for x in the equation \(x^2+1-(x+1)=0\):
\[
x^2+1-x-1=0
\]
Simplify to get a quadratic equation:
\[
x^2-x=0
\]
Factoring the quadratic equation, we get:
\[
x(x-1)=0
\]
So, we have two solutions in this case:
1. \(x=0\)
2. \(x=1\)
Putting together the solutions from both cases, we obtain the final solutions to the given equation: \(x=-1\), \(x=0\), and \(x=1\).
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Key Concepts
These are the key concepts you need to understand to accurately answer the question.
Factoring
Factoring is a key concept in solving algebraic equations and is often used to simplify expressions or solve equations. When you factor an expression, you are essentially breaking it down into a product of simpler terms, or factors. These factors, when multiplied together, give back the original expression.
In the context of the given problem, we need to factor out a common term from an equation. Recognizing a common factor is pivotal because it helps streamline solving techniques.
In the context of the given problem, we need to factor out a common term from an equation. Recognizing a common factor is pivotal because it helps streamline solving techniques.
- Identify common factors in algebraic expressions.
- Extract or "factor out" the common term to simplify the equation.
- Use factoring to reduce complexity, allowing for easier application of further solving methods.
Zero-Product Property
The zero-product property is a foundational principle in algebra that facilitates solving equations where one or more factors equal zero. This property states that if a product of several factors equals zero, at least one of the factors must be zero.
To apply this property, follow these steps:
To apply this property, follow these steps:
- Rewrite the equation as a product of factors equaling zero.
- Set each factor in the product equal to zero separately.
- Solve each resulting equation to find all possible solutions.
Cubic Roots
Cubic roots, represented as \( \sqrt[3]{x} \), denote the value which, when raised to the third power (cubed), results in \( x \). Understanding cubic roots is essential in simplifying and solving equations involving radicals.
For an equation involving cubic roots:
Recognizing how to manipulate the exponents within these roots helped us apply the zero-product property effectively.
For an equation involving cubic roots:
- Isolate the cubic root if possible.
- Raise both sides of the equation to the power of three to eliminate the cubic root.
- Solve the resulting equation, which is often simpler and more straightforward.
Recognizing how to manipulate the exponents within these roots helped us apply the zero-product property effectively.