Question

У=1/21x^3+2/7x^2-3X+1/3

Answer 1

У=1/21x^3+2/7x^2-3X+1/3=1/21x^3(1+6x-63x^3+7x^3)=1/21x^3(1+6x-54x^3)

Answer 2

It looks like you've provided a polynomial function:

U(x) = (1/21)x^3 + (2/7)x^2 - 3x + 1/3

This is a cubic polynomial, and it can be used for various purposes in mathematics and science, depending on the context. If you have any specific questions or tasks related to this polynomial, please let me know, and I'll be happy to assist you further.