we know that `8 = 2^3`

Further we know the following rule regarding indices.

`(a^b)^(c) = a^(bc)`

So we can write `8^(2x+3) ` as;

`(2^3)^(2x+3)`

`= 2^(3(2x+3))`

`= 2^(6x+9)`

*So finally*

*`2^(6x+9) = 2^y ` where `y = 6x+9` *

we know that `8 = 2^3`

Further we know the following rule regarding indices.

`(a^b)^(c) = a^(bc)`

So we can write `8^(2x+3) ` as;

`(2^3)^(2x+3)`

`= 2^(3(2x+3))`

`= 2^(6x+9)`

*So finally*

*`2^(6x+9) = 2^y ` where `y = 6x+9` *