Solve each polynomial equation in Exercises 1–10 by factoring and then using the zero-product principle. $3 x^{4} = 81 x$

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Start by rewriting the equation to set it equal to zero: $3x^4 - 81x = 0$.

Factor out the greatest common factor (GCF) from the left side. Identify the GCF of \$3x^4$ and $81x$, which is $3x$, and factor it out: $3x(x^3 - 27) = 0$.

Recognize that $x^3 - 27$ is a difference of cubes, since $27 = 3^3$. Use the difference of cubes formula: $a^3 - b^3 = (a - b)(a^2 + ab + b^2)$, where $a = x$ and $b = 3$.

Apply the formula to factor $x^3 - 27$ as $(x - 3)(x^2 + 3x + 9)$, so the full factorization is $3x(x - 3)(x^2 + 3x + 9) = 0$.

Use the zero-product principle, which states that if a product of factors equals zero, then at least one of the factors must be zero. Set each factor equal to zero: $3x = 0$, $x - 3 = 0$, and $x^2 + 3x + 9 = 0$, then solve each equation for $x$.

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주요 개념

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Polynomial Equations

A polynomial equation involves expressions with variables raised to whole-number exponents and coefficients. Solving these equations means finding all values of the variable that make the equation true. Understanding the structure of polynomials helps in applying appropriate methods like factoring.

Factoring Polynomials

Factoring is rewriting a polynomial as a product of simpler polynomials or factors. This process simplifies solving equations by breaking them down into manageable parts. Common factoring techniques include factoring out the greatest common factor, difference of squares, and grouping.

Zero-Product Principle

The zero-product principle states that if the product of two or more factors equals zero, then at least one of the factors must be zero. This principle allows us to set each factor equal to zero and solve for the variable, providing the solutions to the polynomial equation.

Solve each polynomial equation in Exercises 1–10 by factoring and then using the zero-product principle. 3x4=81x3x^4 = 81x