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what is the product of 3a(a + 4)

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Dave F. | Math and Excel Tutor - elementary school up to middle school subjectsMath and Excel Tutor - elementary school...
Distribute 3a over both terms within the parenthesis.
Multiply 3a by a to get 3a2
Multiply 3a by +4 to get 12a
Add all terms by adding 3ato 12a to get an answer of "3a+12a"