Another Functional Equation 3

Algebra Level 4

f(xy)=f(x)+xy+f(y)\large{f(x-y) = f(x) + xy + f(y)}

Let f:RRf: \mathbb R \to \mathbb R be a function satisfying the above functional equation for every xRx \in \mathbb R. Then find the value of f(20.15)f(20.15) to three places of decimals.

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