#### Answer

9 -6 -3
-12 0 12
3 6 -9

#### Work Step by Step

horizontal:
$9-6-3=0$
$-12+0+12=0$
$3+6-9=0$
vertical:
$9-12+3=0$
$-6+0+6=0$
$-3+12-9=0$
diagonal:
$9+0-9=0$
$3+6-9=0$

Published by
Pearson

ISBN 10:
0321726391

ISBN 13:
978-0-32172-639-1

9 -6 -3
-12 0 12
3 6 -9

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