Domanda del libro di testo
Solve each equation in Exercises 83–108 by the method of your choice.
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Ch. 1 - Equations and Inequalities
Blitzer8th EditionCollege AlgebraISBN: 9780136970514
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TOC.tableOfContents
- Ch. P - Fundamental Concepts of Algebra311
- Ch. 1 - Equations and Inequalities398
- Ch. 2 - Functions and Graphs407
- Ch. 3 - Polynomial and Rational Functions306
- Ch. 4 - Exponential and Logarithmic Functions247
- Ch. 5 - Systems of Equations and Inequalities173
- Ch. 6 - Matrices and Determinants143
- Ch. 7 - Conic Sections124
- Ch. 8 - Sequences, Induction, and Probability251
Capitolo 2, Problema 88
In Exercises 85–90, find the x-intercepts of the graph of each equation. Then use the x-intercepts to match the equation with its graph. [The graphs are labeled (a) through (f).]
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To find the x-intercepts of the graph, set the equation equal to zero: \(y = x^{-2} - x^{-1} - 6 = 0\).
Rewrite the negative exponents as fractions to make the equation easier to work with: \(\frac{1}{x^2} - \frac{1}{x} - 6 = 0\).
Multiply both sides of the equation by \(x^2\) (assuming \(x \neq 0\)) to eliminate the denominators: \(1 - x - 6x^2 = 0\).
Rearrange the equation into standard quadratic form: \(-6x^2 - x + 1 = 0\). You can multiply both sides by \(-1\) to get \(6x^2 + x - 1 = 0\) for easier solving.
Use the quadratic formula \(x = \frac{-b \pm \sqrt{b^2 - 4ac}}{2a}\) with \(a=6\), \(b=1\), and \(c=-1\) to find the values of \(x\) where the graph crosses the x-axis.
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X-Intercepts of a Graph
X-intercepts are the points where the graph crosses the x-axis, meaning the y-value is zero. To find them, set y = 0 and solve the resulting equation for x. These points help identify key features of the graph and are essential for matching equations to their graphs.
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Graphing Intercepts
Solving Equations with Negative Exponents
Negative exponents indicate reciprocals, such as x^(-1) = 1/x. When solving equations with negative exponents, rewrite terms as fractions to simplify and solve. Understanding this helps in manipulating the equation to find x-intercepts accurately.
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5:02Solving Logarithmic Equations
Graph Behavior of Rational Functions
Functions with negative exponents often represent rational functions with variables in denominators. Their graphs can have vertical asymptotes and discontinuities where the denominator is zero. Recognizing these behaviors aids in matching equations to their correct graphs.
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8:19How to Graph Rational Functions
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