Question

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

Answer 1

Ta có: \(5^x+5^{x+2}=650\)

=>\(5^x+5^x\cdot25=650\)

=>\(5^x\cdot26=650\)

=>\(5^x=\dfrac{650}{26}=25=5^2\)

=>x=2