If: x2 = 81
Then: x = 9 or x = -9
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x2-81=(x-9)(x+9) Factors: x-9, x+9
Factors are just numbers 81 can be divided by. The whole number factors are 1, 3, 9, 27, and 81
The factors of...72= 1, 2, 3, 4, 6, 8, 9, 12, 18, 24, 36, and 7281= 1, 3, 9, 27, and 81The Greatest Common Factor= 9
The factors of 81 are 1, 3, 9, 27, 81. For them to be common, they need to be compared to another set of factors.
100x2-81