or the quadratic function f(x) = x+2x+1, answer parts (a) through (f). ..... Type your answer in interval notation.) ) Determine where f(x) > 0 and where f(x) < 0. Select the correct choice below answer box(es) within your choice. Type your answer in interval notation. Use integers or fractions for any number expression.) A. f(x)<0 on and f(x) is never positive B. f(x)> 0 on and f(x) is never negative O C. f(x) >0 on and f(x) < 0 on

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