Find the inflection point(s) for the function f left parenthesis x right parenthesis equals short dash x to the power of 5 plus 5 x to the power of 4 plus 12 x minus 2. left parenthesis 0 comma short dash 2 right parenthesis and left parenthesis 3 comma 196 right parenthesis left parenthesis 3 comma 196 right parenthesis left parenthesis 3 comma 0 right parenthesis left parenthesis 3 comma 147 right parenthesis