f(x)= -2x-4;r(x)=f(1/2x)

Question

I don't know how to do it ,somone can help

me

Answer 1

Evaluate f(x) when x=(1/2)x

 

 

r(x) = f((1/2)x)

 

r(x) = -2(x/2) - 4

 

r(x) = -x - 4

Answer 2

Hi,

        The instructions say to substitute 1/2x in place of x in f(x)i.e. so r(x) =-2(1/2x)-4 = (-1/x)-4.

 

Got it?

 

Jim