# Find the value of an expression (a^(2)-b^(2))/(ab):(1/b - 1/a) at a-3(15)/(19),b=7 4/(19)

Find the value of an expression $\frac{{a}^{2}-{b}^{2}}{ab}:\left(\frac{1}{b}-\frac{1}{a}\right)$ at $a=3\frac{15}{19},b=7\frac{4}{19}$
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soyafh
$.......=\frac{\left(a-b\right)\left(a+b\right)}{ab}﻿\ast \frac{ab}{a-b}=a+b$
at $a=3\frac{15}{19},b=7\frac{4}{19}$
$3\frac{15}{19}+7\frac{4}{19}=11$