I don't know what your question means, but 7 cubed is 343, so the cubic root of 343 is 7.
[tex] 7^3 = 343 [/tex]
[tex] \sqrt[3]{343} = 7 [/tex]
Exponent and root are inverse operations.
If you square 5 to get 25, then when you take the square root of 25 you get 5.
7^3 = 343, so the cubic root of 343 is 7.
