Find an equation of the curve whose tangent line has a slope of f' (x ) = 4x -8/9 given that the point ( - 1, - 6) is on the curve.

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Find an equation of the curve whose tangent line has a slope of f' (x ) = 4x -8/9given that the point ( - 1, - 6) is on the curve.The function f(x) satisfying f'(x) = 4x and f( - 1) = -6 is f(x) =