Question

Tìm x

5^x + 5^x+2 =650

Answer 1

\(5^x+5^{x+2}=650\)

\(\Rightarrow5^x+5^x\cdot5^2=650\)

\(\Rightarrow5^x\left(1+5^2\right)=650\)

\(\Rightarrow5^x\cdot26=650\)

\(\Rightarrow5^x=25\)

\(\Rightarrow5^x=5^2\Rightarrow x=2\)

Answer 2

\(5^x+5^{x+2}=650\)

\(\Rightarrow5^x+5^x.5^2=650\)

\(\Rightarrow5^x\left(1+5^2\right)=650\)

\(\Rightarrow5^x.26=650\)

\(\Rightarrow5^x=25\)

\(\Rightarrow5^x=5^2\)

\(\Rightarrow x=2\)

Vậy \(x=2\)

Answer 3

x= 2

Answer 4

5^x +5^x . 5² =650

5^x . ( 5² + 1) = 650

5^x . 26 =650

5^x =650/26

5^x =25

5^x =5²

^{x =2}

​vậy x = 2