- #1
ghostbuster25
- 102
- 0
Just want to check that i am doing this question correctly.
f(x) = 2x+5 h(x) = 1/x , x [tex]\neq[/tex]0
Find the inverse of fh(x)
So first i found the function fh(x)
2*1/x+5
then let y = 2*1/x+5 , x [tex]\neq[/tex]0
now this is the bit i can't rememeber how to do, when i try and make x the subject do i need to multiply the 2 on the RHS as well as the y on the LHS?
if i multiply the 2 then i end up with f-1(x)=2x+5/x
If i don't i end up with f-1(x) = x+7
f(x) = 2x+5 h(x) = 1/x , x [tex]\neq[/tex]0
Find the inverse of fh(x)
So first i found the function fh(x)
2*1/x+5
then let y = 2*1/x+5 , x [tex]\neq[/tex]0
now this is the bit i can't rememeber how to do, when i try and make x the subject do i need to multiply the 2 on the RHS as well as the y on the LHS?
if i multiply the 2 then i end up with f-1(x)=2x+5/x
If i don't i end up with f-1(x) = x+7