tolong jawabannya,, beserta cara kerjanya??

8^(2/3) - 27^(-2/3)
= 2^(3 × 2/3) - 3^(3 × -2/3)
= 2^2 - 3^(-2)
= 4 - 1/3^2
= 4 - 1/9
= 36/9 - 1/9
= 35/9
= 3 8/9 (a)