Question

( 2x - 1 )⁴ =81 tìm x 

Answer 1

(2x-1)⁴=81

(2x-1)⁴=3⁴

=>2x-1=3

2x=3+1

2x=4

x=4:2

x=2

Answer 2

Ta có:\(\left(2x-1\right)^4\)=81

=>\(\left(2x-1\right)^4\)=\(3^4\)

=>2x-1=-3 =>2x=-2 =>x=-1 hoặc 2x-1=3 =>2x=4 =>x=2

Vậy x= -1 hoặc x=2

Answer 3

( 2^x - 1 )⁴ = 3⁴

2^x  - 1 = 3

2^x       = 3 + 1

2^x        = 4

x          = 4 : 2

x          = 2

Answer 4

( 2x - 1 ) ⁴ = 81

( 2x - 1 ) ⁴ = 3⁴

=> 2x - 1 = 3

2x = 3 + 1

2x = 4

x = 4 : 2

x = 2

Answer 5

(2x-1)^4=81

       2x-1=3^4

       2x-1=3

           2x=4

             x=4:2

             x=2 

cho mik xin sao nha