Question

Tìm x , biết : 2^x+1+2^x=48

Answer 1

<=> 3.2^x=48

=> 2^x=16=2⁴ => x=4

Đáp số: x=4

Answer 2

2^x+1+2^x=48

2^x+1+2^x=2⁵.3

2^4=x=2

Answer 3

2^x+1+2^x=48

\(2^x\cdot2^1+2^x\cdot1=48\)

\(2^x\cdot\left(2^1+1\right)=48\)

\(2^x\cdot3=48\)

\(2^x=\frac{48}{3}\)

\(2^x=16\)

\(2^x=2^4\)

\(\Rightarrow x=4\)