If `f(x)=3x^(2)+4x-1`, then find the approximate value of `f(3.1)`.

If `f(x)=3x^(2)+4x-1`, then find the approximate value of `f(3.1)`.
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If `f(x)=3x^(2)+4x-1`, then find the approximate value of `f(3.1)`.
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