tolong bantuannya ya tq

(akar 5 - akar 6) / (akar 5 + akar 6)
= (akar 5 - akat 6)^2 / (akar 5 + akar 6)(akar 5 - akar 6)
= 5 - 2(akar 5)(akar 6) + 6 / 5 - 6
= 5 - 2 (akar 30) + 6/ -1
= -5 + 2 (akar 30) - 6
= -11 + 2 (akar 30)

Maka,
a = -11
b = 2

a - b = -11 - 2 = -13 (A)