Which expression is equivalent to open paren 2 g cubed plus 4 close paren squared ?

Square each term using (a + b)² = a² + 2ab + b². Here, (2g³ + 4)² = (2g³)² + 2(2g³)(4) + 4² = 4g⁶ + 16g³ + 16. This matches choice B.

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