College Algebra (10th Edition)

Published by Pearson
ISBN 10: 0321979478
ISBN 13: 978-0-32197-947-6

Chapter 1 - Section 1.1 - Linear Equations - 1.1 Assess Your Understanding - Page 91: 64

Answer

The solution set is $\{2\}$.

Work Step by Step

STEP 1: Restrictions. There must be no zeros in the denominator, so $\left[\begin{array}{lll} 5z-11\neq 0 & 2z-3\neq 0 & 5-z\neq 0\\ z\neq 11/5 & z\neq 3/2 & z\neq 5 \end{array}\right]$ STEP 2: Fractions. The LCM of all denominators is $(5z-11)(2z-3)(5-z)$ After multiplying both sides with the LCM, $5(2z-3)(5-z) +4(5z-11)(5-z) =-3(5z-11)(2z-3)$ STEP 3: Remove all parentheses and simplify. $5(-2z^{2}+13z-15)+4(-5z^{2}+36z-55)=-3(10z^{2}-37z+33)$ $-10z^{2}+65z-75-20z^{2}+144z-220=-30z^{2}+111z-99$ $-30z^{2}+209z-295=-30z^{2}+111z-99$ STEP 4: Variables on one side, all other terms on the other... Add $30z^{2}-111z+295$ to both sides, $98z=196$ STEP 5: Simplify and solve. $98z=196\qquad/\div 98$ $z=2$ No restriction prevents $2$ being a solution, so the solution set is $\{2\}$
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