Question

7.2^x =2⁹ +5.2⁸ giúp mik với

Answer 1

\(\Leftrightarrow7\cdot2^x=2^8\left(2+5\right)=2^8\cdot7\)

=>x=8

Answer 2

7.2^x=2^9+5.2^8

<=>7.2^x=2^8.(2+5)=2^8.7

<=>2^x=2^8

<=>x=8

Answer 3

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

\(7.2^x=512+5.256\)

\(7.2^x=1792\)

\(2^x=1792:7\)

\(2^x=256\)

\(x=256:2\)

\(x=128\)

Answer 4

`7.2^x = 2^9 + 5.2^8`

`=> 7.2^x = 2^8 .2 + 5 . 2^8`

`=> 7.2^x = 2^8.(2 + 5)`

`=> 7.2^x = 256.7`

`=> 7.2^x = 1792`

`=>   2^x  = 1792 : 7`

`=>  2^x   = 256`

`=> 2^x    = 2^8`

`=>x=8`