6 3√32 + 2 3√108
= 6(32)1/3 + 2(108)1/3
= 6(2*2*2*2*2)1/3 + 2(2*2*3*3*3)1/3
= 6*2(2*2)1/3 + 2*3(2*2)1/3
= 12(4)1/3 + 6(4)1/3
= 12 3√4 + 6 3√4
= 6(32)1/3 + 2(108)1/3
= 6(2*2*2*2*2)1/3 + 2(2*2*3*3*3)1/3
= 6*2(2*2)1/3 + 2*3(2*2)1/3
= 12(4)1/3 + 6(4)1/3
= 12 3√4 + 6 3√4