Question

tìm x

2^x.4=128

Answer 1

\(2^x.4=128\)

\(2^x.2^2=2^7\)

\(2^{x+2}=2^7\)

\(\Rightarrow x+2=7\)

   x       = 7  - 2 

   x        = 5 

Answer 2

2^x.4=128

2^x=128:4

2^x=32

2^x=2⁵

Vậy x=5