-1 × 81
-3 × 27
-9 × 9
-27 × 3
-81 × 1
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100x2-81
71
If: x2 = 81 Then: x = 9 or x = -9
These factor pairs: (1, 648) (2, 324) (3, 216) (4, 162) (6, 108) (8, 81) (9, 72) (12, 54) (18, 36) (24, 27)
9 x 9 = 81 9 squared = 81 3 squared times 3 squared = 81