yang nomor 3 dan 4 tolong yah..

3ˣ²⁻⁴ˣ⁻⁷  = 243 = 3⁵
x² - 4x - 7 = 5
x² - 4x - 12 = 0
(x - 6)(x +2) =0
x = 6 ∨ x = - 2

a= 32 = 2⁵
b = 27 = 3³

a^(1/5) + b^(1/30 = (32)^(1/5)  + (27)^(1/3) = (2⁵)^(1/5) + (3³)^(1/3)= 2+3=5