3 akar 6 di tambah 3 akar 18 di kurangi 5 akar 6 =

3√6+3√18-5√6 = 3√6+3√3×6-5√6
                           =3√6+3.3√6-5√6
                           =3√6+9√6-5√6 (kalo akarnya udah sama jadi kamu langsung         jumlahin aja )
                           =3+9-5√6
                           =7√6