Question

X2-81/4=0 como se resolver?

Answer 1

x² -  81    =  0
       -----
         4

x² =     81
          ------
            4

x = √81
      --------
        √4

x =   9
      ------
        2

x = - 9
      ------
         2

Resp.: x = 9/2 e x = - 9/2

Answer 2

Boa tarde Mateus

x² - 81/4 = 0

x² = 81/4

x1 = -√(81/9) = -9/2 , x2 = √(81/9) = 9/2