Question

2.3^x + 5.3^{x + 1} = 153

Answer 1

\(2.3^x+5.3^x.3=153\Leftrightarrow2.3^x+15.3^x=153\)

\(\Leftrightarrow17.3^x=153\Leftrightarrow3^x=9\Leftrightarrow x=2\)

Answer 2

\(\Leftrightarrow2.3^x+5.3.3^x=153\)

\(\Leftrightarrow17.3^x=3^2.17\)

\(\Leftrightarrow3^x=3^2\Rightarrow x=2\)

Answer 3

Bạn xem lại đề

Answer 4

2.3\(^x\) + 5.3\(^{x+1}\) = 153

3\(^x\).(2 + 15) = 153

3\(^x\). 17 = 153

3\(^x\)     = 153: 17

3\(^x\)     =  9

3\(^x\)     = 3²

\(x\)      = 2

 

Answer 5

x = 2