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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.

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14y ago

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