Question

tìm x : 

2^x-1-12=20

Answer 1

2^x-1-12=20

2^x-1=20+12

2^x-1=32

2^x-1=2⁵

x-1=5

x=6

Answer 2

\(\Rightarrow2^{x-1}=32=2^5\\ \Rightarrow x-1=5\\ \Rightarrow x=6\)

Answer 3

2^x-1=32
2^x-1=2^5
x-1    = 5
x        = 6

Answer 4

2^x-1-12=20

2^x-1=20+12

2^x-1=32

2^x-1=2⁵

x-1=5

x=6