Algebra 2 (1st Edition)

Published by McDougal Littell
ISBN 10: 0618595414
ISBN 13: 978-0-61859-541-9

Chapter 4 Quadratic Functions and Factoring - Chapter Review - Page 322: 42

Answer

See below

Work Step by Step

Given: $y=2x^2-11x+5$ The x-intercept of this function's graph occurs at $x$ such that $y=0$. Then $2x^2-11x+5=0$ The solution to this equation is: $x=\frac{-(-11)\pm \sqrt (-11)^2-4.2.5}{2(2)}=\frac{11 \pm\sqrt 81}{4}=\frac{11 \pm 9}{4}$ Hence, $x=5 \lor x=0.5$ From the graph, we can see that the solution is $0.5 \lt x \lt 5$
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