Question

3^x . 3^x-1 = 27³

Answer 1

3^x.3^x-1=27³

3^2x-1=3⁹

=>2x-1=9

2x=9+1

2x=10

x=10:2

x=5

Answer 2

3^x.3^x-1=27³

3^x+x-1=3⁹

3^2x-1=3⁹

2x-1=9

2x=10

nhớ k cho mình nha

x=5

Answer 3

\(3^x.3^{x-1}=27^3\)

\(3^x.3^x:3=27^3\)

\(3^x.3^x:3=27^3\)

\(3^x.3^x:3=19683\)

\(3^x.3^x=19683.3\)

\(3^x.3^x=59049\)

\(\left(3^x\right)^2=59049\)

\(\left(3^x\right)^2=243^2\)

\(3^x=243\)

\(3^x=3^5\)

\(\Rightarrow x=5\)