What is the completely factored form of the expression 16 x squared plus 8 x plus 32 ?

The greatest common factor of 16x², 8x, and 32 is 8. Factoring it out gives 8(2x² + x + 4). The trinomial inside has no further integer factorization, so the completely factored form is 8(2x² + x + 4), choice D.

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