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: 14

Answer

x=-9 or 2

Work Step by Step

Rewrite the equation in standard form. x$^2$+7x=18 x$^2$+7x-18+0 Factor the trinomial. (x+9)(x-2)=0 Set each variable factor as equal to zero and then isolate the variable to find the solutions. x+9=0 or x-2=0 x=-9 or x=2 Enter the original equation into your graphing utility to observe that the graph crosses the x-axis at -9 and 2.
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