C is the answer hope this helps.
Answer:
The value of f(x) when x=-1 is 0.5
Therefore
Step-by-step explanation:
Given that y=f(x)=
to find the f(x) when x=-1 :
That is to find f(-1)
Put x=-1 in the given function f(x)=
Therefore
The value of f(x) when x=-1 is 0.5
If x=1 and y=5 we get as 4product of 1+5=9
=4+5=9
9=9
lhs=rhs
I did the work and it's D. i believe