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Answer :

Answer: 40x^6 (option 3)

Step-by-step explanation:

Answer:

[tex]40x^{3}[/tex]

Step-by-step explanation:

You can find the answer by doing the following steps:

[tex](5x^{3} )(2x)^{3} = (5x^{3})(8x^{3})= 40x^{6}[/tex]