Question

tìm x:

3^x+2+3^x+3=810

Answer 1

\(3^{x+2}+3^{x+3}=810\)

\(\Rightarrow6^{2x+5}=810\)

\(\Rightarrow2x+5=810:6\)

\(2x+5=135\)

\(\Rightarrow2x=135-5\)

\(2x=130\)

\(x=130:2\)

\(x=65\)

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Answer 2

đề :

\(3^x.3^2+3^x.3^3=810\)

\(3^x\left(3^2+3^3\right)=810\)

...?...

Answer 3

\(3^{x+2}+3^{x+3}=810\)

\(3^x\cdot2+3^x\cdot3=810\)

\(3^x\cdot\left(2+3\right)=810\)

\(3^x\cdot5=810\)

\(3^x=162\)