(a + 9)(a - 9)
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If that's -81, there is a formula for the "difference of squares." In this case, the answer is (a + 9)(a - 9)
Since 81 is not divisible by 7 therefore, 7 is not a factor of 81.
No, 18 is not a factor of 81.
Nine is the highest common factor of 81 and 9
The GCF of 53 and 81 is 1.
The greatest common factor of 56 and 81 is 1.