What is the fully factored form of 32a3 + 12a2?

The greatest common factor of 32a³ and 12a² is 4a². Factoring it out gives 32a³ + 12a² = 4a²(8a + 3). The expression inside the parentheses has no further common factor, so the fully factored form is choice A, 4a²(8a + 3).

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