If x=p/q is a rational zero of a polynomial, then p is a factor of the constant term and q is a factor of the coefficient of the lead term.
List the factors of 14 : + or - 14, + or -1, + or -7, + or - 2
List the factors of the lead term (x^5...the coefficient is 1): + or - 1
The potential rational zeroes are 14/1, -14/1, 7/1, -7/1, 1/1, -1/1, -2/1, 2/1
Keep in mind I didn't list duplicates. For example +14/-1 = -14/+1.
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