(akar 2 + akar 3) pangkat 2 =

[tex]={ \left( \sqrt { 2 } +\sqrt { 3 } \right) }^{ 2 }\\ ={ \left( \sqrt { 2 } \right) }^{ 2 }+2\cdot \sqrt { 2 } \cdot \sqrt { 3 } +{ \left( \sqrt { 3 } \right) }^{ 2 }\\ =2+2\sqrt { 6 } +3\\ =5+2\sqrt { 6 } [/tex]

(√2+√3)^2
= (√2+√3)(√2+√3)
= (√2)^2+(√2√3)+(√3√2)+(√3)^2
= 2+(2√6)+3
= 5+2√6