Intermediate Algebra (12th Edition)

Published by Pearson
ISBN 10: 0321969359
ISBN 13: 978-0-32196-935-4

Chapter 8 - Chapter 8 Test - Page 577: 8

Answer

Discriminant: 88 Nature of Solutions: two irrational solutions

Work Step by Step

Using $ax^2+bx+c=0$, the given equation $ 2x^2-8x-3=0 $ has \begin{align*} a=2,b=-8,\text{ and }c=-3 .\end{align*} Using $ b^2-4ac $ or the discriminant, then \begin{align*} b^2-4ac&\Rightarrow (-8)^2-4(2)(-3) \\&= 64+24 \\&= 88 .\end{align*} Since the discriminat is $88$ (which is a positive and a nonperfect square number), then the equation $2x^2-8x-3=0$ has two irrational solutions.
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