College Algebra 7th Edition

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

Chapter 1, Equations and Graphs - Section 1.4 - Solving Quadratic Equations - 1.4 Exercises - Page 123: 64

Answer

$x=1$ or $x=1+\frac{1}{a}$

Work Step by Step

$ax^2-(2a+1)x+(a+1)=0$ Solving for the trinomial using the quadratic formula for the quadratic equation of $ax^2+bx+c$, $x=\frac{-b \pm \sqrt {b^2-4ac}}{2a}$. Thus, In this case, $ax^2-(2a+1)x+(a+1)$, $a=a, b=-(2a+1), c=(a+1)$ Therefore, $x=\frac{2a+1 \pm \sqrt {(2a+1)^2-4\times a(a+1)}}{2a}=\frac{2a+1 \pm \sqrt {4a^2+4a+1-4a^2-4a}}{2a}=\frac{2a+1\pm1}{2a}$ thus, $x=1$ or $x=1+\frac{1}{a}$
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