Expression 9: "f" left parenthesis, "x" , right parenthesis equals StartFraction, left parenthesis, "d" minus "x" , right parenthesis Over "v" Subscript, "b" , Baseline , EndFraction plus StartFraction, StartRoot, "h" squared plus "s" squared plus "x" squared , EndRoot Over "v" Subscript, "c" , Baseline , EndFractionfx=d−xvb+h2+s2+x2vc