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10. [0/0.66 Points] DETAILS PREVIOUS ANSWERS TAMUBUSCALC1 2.3.010. 1/6 Submissions Used For which value(s) of x does the graph of f(x) = x' + 6x2 + 12x + 1 have a horizontal tangent line? (Enter your answers as a comma-separated list. If an answer does not exist, enter DNE.) X = dne X Submit Answer 11. [-/0.66 Points] DETAILS TAMUBUSCALC1 2.3.011. 0/6 Submissions Used For what value(s) of x is the tangent line of the graph of f(x) = 3x - 45x2 + 83x - 56 parallel to the line y = 2x - 0.8? Hint: Parallel lines must have the same slope. (Enter your answers as a comma-separated list. If X Submit