Question

3 mũ 2x+1=27

tìm x

 

Answer 1

\(3^{2x+1}=27\)

\(\Rightarrow3^{2x+1}=3^3\)

\(\Rightarrow2x+1=3\)

\(\Rightarrow2x=2\)

\(\Rightarrow x=1\)

 

Answer 2

\(3^{2x+1}=27\)

\(\Rightarrow3^{2x}.3=27\)

\(\Rightarrow3^{2x}=27:3\)

\(\Rightarrow3^{2x}=9\)

\(\Rightarrow3^{2x}=3^2\)

\(\Rightarrow2x=2\)

\(\Rightarrow x=1\)

Vậy x = 1

Answer 3

3^2x+1= 27

3^2x+1= 3³

=> 2x+1=3

2x= 3-1

2x= 2

x= 2 : 2

x=1

Answer 4

3 mũ 2x+1=27

tìm x