(3x + 9)(x - 3) ie 3.(x + 3)(x - 3)
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The prime factor of 27 is 3. The prime factors of 26 are 2 and 13.
3x2 + 36x + 81 = 3(x2 + 12x + 27) = 3(x + 3)(x + 9), which are its prime factors; or, if you prefer, 3x2 + 36x + 81 = (3x + 9)(x + 9), which is also accurate. You may easily verify these results by multiplying back.
27 is a composite number having prime factors 3x3x3 or 33.
If it has no prime factors in common. The prime factors of 16 are all twos and the prime factors of 27 are all threes. 16/27 has to be in simplest form.
The number 27 has only one prime factor: 3.