Answer
assume $x = $-3
Work Step by Step
$x^{2}$ + $7x$ + 12 $\ne $0
for x= -3
$-3^{2}$ + $7\times $-3 + 12 = 0
hence proved
Elementary Geometry for College Students (5th Edition)
by Alexander, Daniel C.; Koeberlein, Geralyn M.
Published by
Brooks Cole
ISBN 10:
1439047901
ISBN 13:
978-1-43904-790-3
Chapter 2 - Review Exercises - Page 124: 37
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