Suppose \(a,b\) denote the distinct real roots of the quadratic polynomial \({x}^{2}+20x-2020\) and suppose \(c,d\) deno…

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

[JEE Advanced 2020]