Algebra and Trigonometry 10th Edition

Published by Cengage Learning
ISBN 10: 9781337271172
ISBN 13: 978-1-33727-117-2

Chapter 3 - 3.4 - Zeroes of Polynomial Functions - 3.4 Exercises - Page 283: 15


x = -2, -1, and 1

Work Step by Step

The Rational Zero Test relies on finding possible zeros and testing to see if they are actually zeros. The possible zeros are all the factors of the constant term divided by all the factors of the leading coefficient. f(x) = $x^{3}$ + 2$x^{2}$ - x - 2 Factors of the constant: $\pm$ 1 and $\pm$2 Factors of the leading coefficient: $\pm$1 All possible combinations: x = $\frac{\pm 1}{\pm 1}$, $\frac{\pm 2}{\pm 1}$ x = 1, -1, 2, -2 The line in the graph passes through the x-axis at x = -2, -1, and 1. Since those are all possible zeros they are confirmed by the graph.
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