Answer
20 and 21
Work Step by Step
$x*(x+1) = 420$
$x^2+x=420$
$x^2+x-420=0$
$x^2+21x-20x-420=0$
$x(x+21)-20(x+21)=0$
$(x+21)(x-20)=0$
$x+21=0$
$x=-21$ (not a valid answer since we can't have negative page numbers)
$x-20=0$
$x=20$
Algebra: A Combined Approach (4th Edition)
by Martin-Gay, Elayn
Published by
Pearson
ISBN 10:
0321726391
ISBN 13:
978-0-32172-639-1
Chapter 6 - Section 6.7 - Quadratic Equations and Problem Solving - Exercise Set - Page 466: 24
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