Question

Given f(x) = 9, find x if f(x) = -3x – 3.​

Answer 1

Question:

`f(x)=9 , f(x)=-3x-3`

Solution:

When
`f(x)` is equal to 9 that means
`f(x)=-3x-3` is equal to 9 too which you can solve by:

`9=-3x-3\\ 9+3=-3x-3+3\\ 12=-3x\\(12)/(-3)=(-3x)/(-3)\\-4=x`

Answer:

`x=-4`

Check:

`-3(-4)-3\\-12-3\\=9`

Hope this was helpful.