College Algebra 7th Edition

Published by Brooks Cole
ISBN 10: 1305115546
ISBN 13: 978-1-30511-554-5

Chapter 3, Polynomial and Rational Functions - Section 3.6 - Rational Functions - 3.6 Exercises - Page 345: 39

Answer

vertical asymptotes: $x=0$ horizontal asymptote: $y=3$

Work Step by Step

Vertical asymptotes occur where the denominator is zero. Thus, we set the denominator to zero and solve for the $x$ values to find the vertical asymptotes: $2x^3+5x^2+6x=0\\x(2x^2+5x+6)=0$ We cannot factor further because this polynomial with degree $2$ has a negative discriminant ($5^2-4(2)(6)=-23)$. Hence, the vertical asymptote is $x=0$ Here, the degrees of the numerator and the denominator are the same. Thus, the horizontal asymptote is the quotient of the leading coefficients: $y=\frac{6}{2}=3$
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