Simplify 2(3sqrt9)/1 + 3sqrt9 + 3sqrt9

I got 3 - 3sqrt9 and -6 but -6 is wrong and 3 - 3sqrt is unsimplified

Why not: 2 * (3 * 3) + (3*3) +(3*3)=36

Because these are cube roots so it's cube root of 9

Simplify 2 * (9)^(1/3) + 9^(1/3) + 9^(1/3)

4 * 3^(2/3)

Cube roots mean that it takes three numbers to get that one number

==2 * 3^(2/3) + (1 * 3^(2/3)) + (1 * 3^(2/3))

==[2 + 1 + 1] * 3^(2/3)

==4 * 3^(2/3) [this is the same as:]

==4 * 9^(1/3)