Learn with an example What is the domain of this function?
(1, -1)
(7,-7)
(-10,-5)
(-8,5)
(9, -7)
(8, -1)

1{-7,-5, -1,5}
2{-10,-8,-1,7,8,9}
3{-7,-5, -1,5,7)
4{-10,-8, 1, 7, 8, 9}
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1- what do you think the product of a nonzero rational number and an irrational number is? is it rational or irrational? make use of variables, the closure property of integers, and possibly a proof by contradiction to prove your hypothesis.2- why do we have to specify that the rational number must be nonzero when we determine what the product of a nonzero rational number and an irrational number is? if the rational number were 0, would it give us the same result we found in the first question?