>>21
2^(1/4) + 32^(1/4) + 162^(1/4)
=2^(1/4)+(2^4*2)^(1/4)+(3^4*2)^(1/4)
=2^(1/4)+2*2^(1/4)+3*2^(1/4)
=6*2^(1/4)