Question

5^x+5^x+3=3150

Answer 1

\(5^x+5^{x+3}=3150\\ \Rightarrow5^x+5^x.125=3150\\ \Rightarrow126.5^x=3150\\ \Rightarrow5^x=25\\ \Rightarrow5^x=5^2\\ \Rightarrow x=2\)

Answer 2

Ta có : 5^x + 5^x+3 = 3150

     5⁵ + 5^x+3  = 5⁵ + 5² 

=> 5^x+3 = 5²

=> x+3 = 2

=> x=-1