Thank you for the opportunity to help you with your question!

first term is 5 and its
factors are 1 and 5

last term is 7 and its
factors are 1 and 7

so +- (1,7)/(1,5) = +-
1/(1,5 ) , +- 7/(1/5)

+- (1,7)/(1,5) = +- 1/1
, +- 1/5, +- 7/1 , +- 7/5

+- (1,7)/(1,5) = +- 1 ,
+- 1/5, +- 7 , +- 7/5 are all possible rational zeros

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