Question

\(7.2^x=2^9+5.2^8\)

Answer 1

`=> 7 . 2^x = 2^8 . 2 + 5 . 2^8`

`=> 7 . 2^x = 7 . 2^8`

`=> x = 8`

Answer 2

\(7.2^x=2^9+5.2^8\\ =>7.2^x=2^8.\left(2^1+5\right)\\ =>7.2^x=7.2^8\\ =>x=8\)

Answer 3

\(7.2^x=2^9+5.2^8\)

\(7.2^x=2^8.\left(2+5\right)\)

\(7.2^x=2^8.7\)

\(\Rightarrow2^x=2^8\)

\(x=8\)

Vậy \(x=8\)

Answer 4

\(7.2^x=512+5.256\)

\(7.2^x=512+1280=1792\)

\(2^x=1792:7=256\)

\(2^x=2^8\)

vậy x = 8

Answer 5

\(7.2^x=2^9+5.2^8\Rightarrow7.2^x=2^8.\left(2^1+5\right)\Rightarrow7.2^x=7.2^8\Rightarrow x=8\)