In Exercises 101–106, solve each equation.x(x+1)3−42(x+1)2=0 x(x + $$1)^3 - 42(x$$ + $$1)^2 = 0$$

Ch. 1 - Equations and Inequalities

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Blitzer 8th Edition

Ch. 1 - Equations and Inequalities

문제 105

2장, 문제 105

In Exercises 101–106, solve each equation. $x (x + 1)^{3} - 42 (x + 1)^{2} = 0$

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Start by observing the given equation: $x(x + 1)^3 - 42(x + 1)^2 = 0$. Notice that both terms contain a common factor involving $(x + 1)^2$.

Factor out the greatest common factor (GCF), which is $(x + 1)^2$, from the entire equation: $ (x + 1)^2 \left[ x(x + 1) - 42 \right] = 0 $.

Simplify the expression inside the brackets: $x(x + 1) - 42 = x^2 + x - 42$.

Set each factor equal to zero to find the solutions: 1) $(x + 1)^2 = 0$ 2) $x^2 + x - 42 = 0$.

Solve each equation separately: - For $(x + 1)^2 = 0$, solve for $x$. - For $x^2 + x - 42 = 0$, use the quadratic formula or factoring to find the values of $x$.

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주요 개념

질문에 올바르게 답하기 위해 반드시 이해해야 하는 핵심 개념들은 다음과 같습니다.

Factoring Polynomial Expressions

Factoring involves rewriting a polynomial as a product of simpler polynomials or expressions. It is essential for solving equations by setting each factor equal to zero. Recognizing common factors, such as powers of (x + 1), helps simplify the equation and find solutions efficiently.

Zero Product Property

The zero product property states that if the product of two or more factors is zero, then at least one of the factors must be zero. This principle allows us to solve polynomial equations by factoring and then setting each factor equal to zero to find all possible solutions.

Solving Polynomial Equations

Solving polynomial equations involves finding all values of the variable that satisfy the equation. After factoring, each factor is set to zero, and the resulting simpler equations are solved. This process may yield multiple roots, including repeated roots if factors have powers greater than one.

In Exercises 101–106, solve each equation.x(x+1)3−42(x+1)2=0 x(x + 1)^3 - 42(x + 1)^2 = 0