Question

3^x + 3^x+2=810

Answer 1

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

\(\Leftrightarrow3^x\left(1+3^2\right)=810\)

\(\Leftrightarrow3^x\cdot10=810\)

\(\Leftrightarrow3^x=81\)

\(\Leftrightarrow x=4\)

Answer 2

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

\(\Rightarrow3^x+3^x.3^2=810\)

\(\Rightarrow3^x.\left(1+3^2\right)=810\)

\(\Rightarrow3^x.10=810\)

\(\Rightarrow3^x=81\)

\(\Rightarrow3^x=3^4\)

\(\Rightarrow x=4\)

Vậy x = 4

Answer 3

3^x+3^x+2=810

3^x+3^x.3²=810

3^x.(3²+1)=810

3^x.10=810

3^x=81

3^x=3⁴

vậy x=4

chúc bạn học tốt(like mình nha)

Answer 4

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

\(3^x.1+3^x.3^2=810\)

\(3^x\left(2^2+1\right)=810\)

\(3^x.10=810\)

\(3^x=810:10\)

\(3^x=81\)

\(3^x=3^4\)

\(\Rightarrow x=4\)