tolong jwab nmr 8 & 11 ya.pkai cranya

Eksponen

8.]
[tex] 1 = 37^{5 - x} [/tex]
5 - x = 0
x = 5

11.]
[tex] 4^{x^2 - 7x - 20} = \frac{1}{16^{x+3}} \\
4^{x^2 - 7x - 20} = 4^{-2(x+3)} [/tex]
x² - 7x - 20 = -2x - 6
x² - 5x - 14 = 0
(x - 7)(x + 2) = 0
x = -2 atau x = 7