Question

(1/9)^x-1=81 Exponencial

Answer 1

$\left(\dfrac{1}{9}\right)^{x-1}=81\\\\\left(\dfrac{1}{9}\right)^{x-1}=\dfrac{1}{9^{-2}}\\\\\left(\dfrac{1}{9}\right)^{x-1}=\left(\dfrac{1}{9}\right)^{-2}\\\\x-1=-2\\\\x=-1$

Answer 2

( 1/9 )ˣ⁻¹ = 9²

( 9 ) ⁻ ⁽ˣ⁻¹⁾ = 9²

9 ⁻ˣ⁺¹ = 9²

- x + 1 = 2

- x = 2 - 1

- x = 1 ( - 1 )

x = - 1   Resposta.