Question 104937
{{{f(x)=system( -x:x<-1,  
        x-2:x>-1)}}}
For problems like this, you have to determine which function applies by checking x against the limits of your function. In other words, is x greater than -1, or is x less than -1(I'm assuming that's what you meant or else your function is undefined between (x=-1) and (x=1)).
When x=-3/4, x >-1, so 
{{{f(x)=x-2}}}
{{{f(-3/4)=-3/4-2}}}
{{{f(-3/4)=-11/4)}}}
When x=-4, x <-1, so 
{{{f(x)=-x}}}
{{{f(-4)=-(-4)}}}
{{{f(-4)=4)}}}