Question

Alguém me ajuda a resolver pfvr
27 elevado a 3-x =1/81=

Answer 1

27³ - X = 1/81

(27.27.27= 19683) - x = 1/81

-x = - 19683 + 1/81                           mmc = 81

- x =    - 1594323 /81  +   1/81    

- x =      - 1594324/81  

- x =     - 19683                    x-1

x = 19683

Answer 2

27^(3-x)=1/81

3³(3-x)=1/3^4

3³(3-x)=3^-4

3(3-x)=-4

9-3x=-4

3x=9+4

3x=13

x=13/3