ka tolong jawab yaa. makasih

4) 4√81
= 4.9
= 36

5)4^2x+1 = 128
(2²)^2x+1 = 2^7
2^4x+2 = 2^7
---> 4x + 2 = 7
----> 4x = 7 - 2
---> 4x = 5
---> x = 5/4

6) 4√27 + 2√75 - 3√48 + 5√12
= 4√3.9 + 2√3.25 - 3.√3.16 + 5√4.3
= 4.3√3 + 2.5√3 - 3.4√3 + 5.2√3
= 12√3 + 10√3 - 12√3 + 10√3
= 20√3