#### 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

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Published by
Brooks Cole

ISBN 10:
9781285195698

ISBN 13:
978-1-28519-569-8

assume $x = $-3

$x^{2}$ + $7x$ + 12 $\ne $0
for x= -3
$-3^{2}$ + $7\times $-3 + 12 = 0
hence proved

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