Suppose $a, b$ denote the distinct real roots of the quadratic polynomial ${\mathrm{x}}^2+20\mathrm{x}-2020$
And suppose $c, d$ denote the distinct complex roots of the quadratic polynomial ${\mathrm{x}}^2-20\mathrm{x}+2020$.
Then the value of $\mathrm{ac}(\mathrm{a}-\mathrm{c})+\mathrm{ad}(\mathrm{a}-\mathrm{d})+\mathrm{bc}(\mathrm{b}-\mathrm{c})+\mathrm{bd}(\mathrm{b}-\mathrm{d})=$