Question 16464
Your possible rational roots must be fractions or whole numbers whose numerators are factors of 15 and whose denominator must be factors of 4:


First the factors of the numerator are:  1, 3, 5, and 15.
The factors of the denominator are: 1, 2, and 4.


All possible factors  with denominator of 1: {{{1}}},{{{  3}}}, {{{  5}}}, {{{  15}}}
All possible factors with denominator of 2:  {{{1/2}}}, {{{ 3/2}}}, {{{5/2}}}, {{{15/2}}}
All possible factors with denominator of 4:  {{{1/4}}}, {{{3/4}}}, {{{5/4}}}, {{{15/4}}}


Put these in one list, and you have all the possible zeros of this polynomial.


R^2 at SCC