Introductory Algebra for College Students (7th Edition)

Published by Pearson
ISBN 10: 0-13417-805-X
ISBN 13: 978-0-13417-805-9

Chapter 6 - Section 6.6 - Solving Quadratic Equations by Factoring - Exercise Set - Page 473: 39


x=-2.5 or 2.5

Work Step by Step

Factor the binomial using the formula for factoring a difference of squares. 4x$^2$-25=0 (2x+5)(2x-5)=0 Set each variable factor as equal to zero and then isolate the variable to find the solutions. 2x+5=0 or 2x-5=0 2x=-5 or 2x=5 x=-2.5 or x=2.5 Enter the equation into your graphing utility to observe that the graph crosses the x-axis at -2.5 and 2.5
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