Merasionalkan 3 per akar 7-2

3/Akar 7 – akar 2

= Akar 7 + akar 2/akar 7 + akar 2

= 3(Akar 7 + akar 2)/7 – akar 14 + akar 14 – 2

= 3(Akar 7 + akar 2)/5