Expression 4: "L" Subscript, "o" "g" , Baseline left parenthesis, "x" , right parenthesis equals negative StartFraction, 1 Over "b" , EndFraction natural log left parenthesis, StartFraction, 0.5 "a" minus "x" Over "x" plus 0.5 "a" , EndFraction , right parenthesisLogx=−1bln0.5a−xx+0.5a