Question

\(3^x+3^{x+2}-2\text{ x 3^x}\)

Tính

Answer 1

\(3^{x+1}+3^{x+2}-2.3^x=30\)

\(3^x.\left(3^1+3^2-2\right)=30\)

\(3^x.10=30\)

\(3^x=3\)

\(=>x=1\)

Answer 2

Đề bài là thế này à/

\(3x+3^{x+2}-2x.3^x\\\)

Answer 3

ĐỀ : \(3^{x+1}+3^{x+2}-2.3^x=30\)

Answer 4

\(3^{x+1}+3^{x+2}-2.3^x=30\)

\(\Rightarrow3^x.3^1+3^x.3^2-2.3^x=30\)

\(\Rightarrow3^x.3+3^x.9-3^x.2=30\)

\(\Rightarrow3^x\left(3+9-2\right)=30\)

\(\Rightarrow3^x.10=30\)

\(\Rightarrow3^x=3\)

\(\Rightarrow x=1\)