Question

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

Answer 1

`=>5^x +5^x *5^2=650`

`=>5^x *(1+5^2 )=650`

`=>5^x *26=650`

`=>5^x=25`

`=>x=2`

Answer 2

5^x + 5^x+2 = 650

Ta có: 5^x + 5^x . 5² = 650

=> 5^x . (1 + 5²) = 650

=> 5^x . 26 = 650

=> 5^x = 650 : 26

=> 5^x = 25 

=> 5^x = 25 = 5² 

=> x = 2.

Answer 3

`5^x + 5^(x+2) = 650`

`<=> 5^x ( 1 + 25 ) =650`

`<=> 26 . 5^x = 650`

`<=>5^x = 25`

`<=> 5^x =5^2`

`<=> x=2`

Vậy `x=2`

Answer 4

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

\(26.5^x=650\)

\(\dfrac{26.5^x}{26}=\dfrac{650}{26}\)

\(5^x=25\)

x = 2

Vậy x= 2.