tolong sekali deijawab dngn cara ya.

No. 1
misal 1/3^x = a
a² - 12a + 27 = 0
(a - 9)(a - 3) = 0
a = 9  a = 3

a = 9
1/3^x = 9
3^-x = 3²
-x = 2
x = -2

a = 3
3^-x = 3
-x = 1
x = -1

x1² + x2² = (-2)² + (-1)²
              = 4 + 1
              = 5

no. 3
² log √x² - 16 = 2
² log √x² - 16 = ² log 2²
√x² - 16 = 4
x² - 16 = 4²
x² - 16 = 16
x² = 16 + 16
x² = 32
x = √32
x = 4√2

x1 = 4√2 atau 2 pangkat 5/2
x2 = -4√2

x log 2 = 2^5/2 log 2
           = 2/5 ² log 2
           = 2/5