Question

3 mủ 2x+2=9 mủ 10

 

Answer 1

\(3^{2x+2}=9^{10}\)

\(\Rightarrow3^{2x+2}=\left(3^2\right)^{10}=3^{20}\)

\(\Rightarrow2x+2=20\)

\(\Rightarrow2x=20-2=18\)

\(\Rightarrow x=18:2=9\)

Answer 2

\(3^{2x+2}=9^{10}\)

\(\Rightarrow\) \(3^{2x+2}=\left(3^2\right)^{10}\)

\(\Rightarrow\) \(3^{2x+2}=3^{20}\)

\(\Rightarrow\) \(2x+2=20\)

\(\Rightarrow\) \(2x=18\)

\(\Rightarrow\) \(x=9\)