Question

[Lê Bảo Hân]

2.3^x + 5.3^{x + 1} = 153

Answer 1

[Đoàn Trần Quỳnh Hương]

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

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

Answer 2

[Nguyễn Ngọc Anh Minh]

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

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

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