Question

tìm x       \(3^{x+1}\) + \(1\) = \(82\)

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Answer 1

3^x+1+1=82

=>3^x+1 =82-1

=>3^x+1=81

=>3^x+1  = 3⁴

=>x+1   =4

=>x=3

Answer 2

=> \(3^{x+1}\) = 82

=> \(3^{x+1}\) = 81

=> \(3^{x+1}\) = \(3^4\)

=> x+1 = 4

=> x = 3

Answer 3

\(3^{x+1}=82-1\)\(\Rightarrow3^{x+1}=81\)

\(3^{x+1}=3^4\Rightarrow x+1=4\)

\(x=4-1\)

\(x=3\)

Answer 4

\(3^{x+1}+1=82\Rightarrow3^{x+1}=81=3^4\Rightarrow x+1=4\Rightarrow x=3\)