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f(x) is cubic polynomial with f(x)=18a n...

`f(x)` is cubic polynomial with `f(x)=18a n df(1)=-1` . Also `f(x)` has local maxima at `x=-1a n df^(prime)(x)` has local minima at `x=0` , then the distance between `(-1,2)a n d(af(a)),` where `x=a` is the point of local minima is `2sqrt(5)` `f(x)` is increasing for `x in [1,2sqrt(5])` `f(x)` has local minima at `x=1` the value of `f(0)=15`

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