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If f:R \to\ R such that f(x+y)-kxy=f(x)...

If `f:R \to\ R` such that `f(x+y)-kxy=f(x)+2y^(2)` for all `x,y \in R` and `f(1)=2,f(2)=8` then `[f(12)-f(6)` is A. 128 B. 324 C. 150 D. 216

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