Question

determinar o valor x para o qual (4/9)elevado a x =81/16

Answer 1

(4/9)^x = 81/16
(4/9)^x = (4/9)⁻²

x = -2

Answer 2

     (4/9)^x = 81/16

      (4/9)^x= (16/81)^-1
  
        (4/9)^x= (4/9)^-2
                
                x = - 2