Question

(1 /3 ) la puterea 9-2x =27

Answer 1

-2x = 3^3 : 3^(-9)
-2x = 3^12
x = (-3^12)/2

Answer 2

$( \frac{1}{3} ) {}^{9 - x} = 27 \\ \\ (3 {}^{ - 1} ) {}^{9 - x} = {3}^{3} \\ \\ 3 {}^{ - (9 - x)} = {3}^{3} \\ \\ 3 {}^{ - 9 + x} = {3}^{3}$

→rezultata prin injectivitate

- 9 + x = 3

x = 3 + 9

x = 12