Question

tìm x :
8.2^x-1 = 256

Answer 1

8 . 2^x-1 = 256

2^x-1 = 256 : 8

2^x-1 = 32

2^x-1 = 2⁵

=> x - 1 = 5

x = 5 + 1 

x = 6

Answer 2

Ta có: 8.2^x-1=256

        => 2^x-1=256: 8 

       => 2^x-1=32

       mà 2⁵ = 32 . Nên x= 5+1 = 6

Vậy x = 6

Answer 3

\(8.2^{x-1}=256\)

    \(2^{x-1}=256:8\)

    \(2^{x-1}=32\)

    \(2^{x-1}=2^5\)

\(\Rightarrow x-1=5\)

\(\Rightarrow x=5+1\)

\(\Rightarrow x=6\)