Question

M(x)=x+5/x+1, n(x)=x-3, what is m(n(x))?

I know the answer is 11/x-4 but I don't know where the 11 came from.
I need it worked out step by step.

Answer 1

subsitute n(x) for x in M(x)


`M(n(x))=(n(x)+5)/(n(x)+1)=`

`M(x-3)=((x-3)+5)/((x-3)+1)=`

`M(x-3)=(x-3+5)/(x-3+1)=`

`M(x-3)=(x+25)/(x-2)=`

I have no idea where you got
`(11)/(x-4)`