Question

3^x+2+3^x=8

giai ho voi

Answer 1

\(\Leftrightarrow3^x\cdot9+3^x=8\)

\(\Leftrightarrow3^x=\dfrac{4}{5}\)

=>\(x\in\varnothing\)

Answer 2

`=> 3^x xx 9 + 3^x xx 1 = 8`.

`=> 3^x xx 10 = 8`

`=> 3^x = 8/10`.

`=> 3^x = 4/5`.

`=> x = -0.2`.

Answer 3

\(3^{x+2}+3^x=8\)

\(3^x.3^2+3^x=8\)

\(3^x.\left(3^2+1\right)=8\)

\(3^x.10=8\)

=> Vô nghiệm