number 8 is written as 3 components sum like that, where the first 2 cube amount(a^3+b^3.that means this sum is the lowest), plus 3rd component (C), multiplied by 9, is the lowest.

It is also known, that the first component is 2 times greater than second one. Find those components.

I do get and I believe this is nonse, what am I doing wrong? ;\

The answer is

Thank you.