tolong ya yang bisa jawab tulis caranya

11) 8√a : 4a^-2/3
= 8a^1/2 : 4a^-2/3
= (8/4)a^ (1/2- - 2/3)
= 2a^(1/2+2/3)
= 2a^7/6
= 2a.akar pangkat 6 dari a... (a)
12) (4^2x)^1/2 = (8)^(3x-2)
= > 4^x = (8)^(3x-2)
=> (2^2)^x = (2^3)^(3x-2)
=> 2^2x = (2)^(9x-6)
=> 2x = 9x -6
=>2x - 9x = -6
=> -7x = -6
x = 6/7....(d)