Precalculus (6th Edition)

Published by Pearson
ISBN 10: 013421742X
ISBN 13: 978-0-13421-742-0

Chapter 9 - Systems and Matrices - Chapter 9 Test Prep - Review Exercises - Page 954: 48

Answer

$\dfrac{1}{31}$

Work Step by Step

tWe are given the determinant equation as: $ \begin{bmatrix} 6x& 2&0 \\1 & 5&3\\x&2&-1 \\ \end{bmatrix}=2x$ Need to simplify the given equation for $x$. $(6x) \times [(5)(-1)-(2)(13)]-2(-1)-2(0)+x\times [(2)(3)-(5)(0)]=2x \\ -66x+2+6x=2x\\62 x=2 \\ x=\dfrac{2}{62}\\ x=\dfrac{1}{31}$ Thus, the obtained value of $x$ is equal to $\dfrac{1}{31}$.
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