Question

 5^x + 5^x+2 =650

Làm giúp mình với nha

Answer 1

       5^x + 5^x+2 = 650

<=> 5^x + 5^x+2 = 625 + 25

<=> 5^x + 5^x+2 = 5⁴   + 5²

=> x = 2

Answer 2

\(5^x\)\(+\)\(5^{x+2}\)\(=\)\(625+25\)

\(5^x\)\(+\)\(5^{x+2}\)\(=\)\(5^4\)\(+5^2\)

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

\(\hept{\begin{cases}\\\end{cases}5^{ }^x=5^2}=>x=2\)

\(\hept{\begin{cases}\\\end{cases}5^{x+2}+2=5^{2+2}=>x=2}\)

vậy x= 2