Solve each equation. 3/(x2+x-2) - 1/(x2-1) = 7/(2x2+6x+4)

Ch. 1 - Equations and Inequalities

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Lial 13th Edition

Ch. 1 - Equations and Inequalities

문제 24

2장, 문제 24

Solve each equation. 3/(x²+x-2) - 1/(x²-1) = 7/(2x²+6x+4)

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First, identify and factor all the quadratic expressions in the denominators to simplify the equation. For the denominators, factor as follows: \(x^{2} + x - 2\), \(x^{2} - 1\), and \(2x^{2} + 6x + 4\).

Rewrite each denominator in its factored form: \(x^{2} + x - 2 = (x + 2)(x - 1)\), \(x^{2} - 1 = (x - 1)(x + 1)\), and \(2x^{2} + 6x + 4 = 2(x + 1)(x + 2)\).

Determine the least common denominator (LCD) by taking the product of the distinct factors with the highest powers: \(2(x - 1)(x + 1)(x + 2)\).

Multiply both sides of the equation by the LCD to eliminate the denominators, resulting in an equation without fractions.

Simplify the resulting equation by distributing and combining like terms, then solve the resulting polynomial equation for \(x\). Remember to check for any excluded values that make the original denominators zero.

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Factoring Quadratic Expressions

Factoring quadratic expressions involves rewriting a quadratic polynomial as a product of two binomials. This is essential for simplifying rational expressions and finding common denominators. For example, x² + x - 2 factors to (x + 2)(x - 1), which helps in identifying restrictions and simplifying the equation.

Finding the Least Common Denominator (LCD)

The least common denominator is the smallest expression that all denominators in a rational equation can divide into evenly. Finding the LCD allows you to combine or compare fractions by eliminating denominators, making it easier to solve the equation. It involves factoring each denominator and taking the highest powers of each factor.

Solving Rational Equations

Solving rational equations requires eliminating denominators by multiplying both sides by the LCD, then solving the resulting polynomial equation. It's important to check for extraneous solutions that make any denominator zero, as these are not valid. This process transforms a complex fraction equation into a simpler polynomial form.