Question

\(\left(1-2x\right)^{4=81}\)

Answer 1

(1-2x)⁴=81

1-2x=3

2x=-2

x=-1

Answer 2

( 1 - 2x )⁴  = 81

( 1 - 2x )⁴ = 3⁴

=> 1 - 2x = 3

2x = 1 - 3

2x = -2 

x= -2 : 2

x = -1

Answer 3

\(^{\left(1-2x\right)^4}\)= 81

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

=> 1- 2x        = 3

2x               = 1 - 3

2x           = -2

x            = -2 : 2 

x         = -1

Vậy, x = -1