Question

Please help me for 15 points

if you don't know please don't try to comment wrong answer
please send with explaination​

Answer 1

x=0 , x=-3

Explanation:

Apply all exponent rules:

`3^(x+3)` =
`3^(x)`×
`3^(3)`

`(1)/(3^(x) )` =
`(3^(x) )^(-1)`

Rewrite equation with
`3^(x)= u`

`u` ×
`3^(3)` +
`u^(-1)` - 28 = 0

Solve for u to give :

u = 1, u = 1/27

Substitute back u =
`3^(x)`, solve for x :

`3^(x)` = 1 , x= 0

`3^(x)= (1)/(27)` , x= -3
x=0 , x=-3

Substituting x back into original equation verifies our answers