Question

Pueden resolverlas?
A) 2x ² - 5 = 67
B) ³√5x +7 = 3
C) 3(x+1)²= 147
D) (2x-1)³= 125
E) √3x-6= 6
F) ³√ 7x-1] +4 = 0

Answer 1

A)  2x^2 = 67+5 = 72
x^2 = 72/2 = 36
x = 6

B)  ³√5x = 3 -7 = -4
    5x =  (-4) ^3
x = - 64 / 5 = -12.8

C) (x+1)²= 147 / 3
     (x+1)= √(147 / 3)
    x = √(147 / 3)  - 1
  X = 7 -1 = 6

D) (2x-1)= ³√125
      2x = ³√125 + 1
      x = ( ³√125 + 1 ) /2
      x = ( 5 + 1 ) /2 = 6 /2 =  3

E) √3x = 6 + 6 
     √3x = 12
       3x = (12 ) ² 
        x = [  (12 ) ²  ] /3
        x = 144 / 3 = 48

F)   [³√ 7x-1] +4 = 0
      [³√ 7x-1] = - 4
      [7x-1]=  ( - 4 )³
      7x = -64 + 1
       x = - 63 /7
       x = -9