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Answer:
D
Explanation:
(x + 4)³ is x + 4 cubed
(x + 4)³ + 3x is the sum of x + 4 cubed and 3x
The thing that is being cubed here is the sum of x and 4, not x or 4 individually. After you have taken care of what is in parentheses, you add 3x, which gives the sum of x+4 cubed and 3x. Hope this helps!