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Menyebabkan:
a = -5
b = 2
Sehingga:
a + b
= -5 + 2
= -3
-------- =a +b√6
√2 +√3
Kali dgn akar sekawan
(√2 -√3 ) (√2-√3)
--------×---------
(√2 +√3) (√2-√3)
(√2)(√2)+(√2)(-√3)+(-√3)(√2)+(-√3)(-√3)
=--------------------------------------------
(√2)(√2)+(√2)(-√3)+(√3)(√2)+(√3)(-√3)
2 -√6 -√6 + 3
=--------------- =a + b√6
2 -√6 +√6 -3
= 5 -2√6
maka ,
a =5 dan b= -2
jadi, a + b = 5+(-2) =3