tolong bantu kerjain 2 soal ini ya, makasihh

semoga membantu
terima kasih

Nomor 11
(4^2)^x+3 = (4^-3)^4-2x
(4)^2x+6 = (4)^-12+6x
2x + 6 = -12 + 6x
6x - 2x = 6 + 12
4x = 18
x = 18/4
x = 9/2 [jawabannya C]

Nomor 12
= [(√a/√b + 1)² + (√a/√b - 1)²]^-1
= [(a/b + 2.√a/√b + 1) + (a/b - 2.√a/√b + 1)]^-1
= [a/b + a/b+ 1 + 1]^-1
= [2a/b + 2]^-1
= [2a/b + 2b/b] ^-1
= b/2(a+b) [jawabannya E]