Question 274584
3√125 - 2√80

3*sqrt(5*25) - 2*sqrt(5*16) =

3*sqrt(5)*sqrt(25) - 2*sqrt(5)*sqrt(16) =

3*sqrt(5)*5 - 2*sqrt(5)*4 =

15*sqrt(5) - 8*sqrt(5) = 7*sqrt(5)