Is 2(x - 4) + x + x and 2[ (x - 4) + x] equivalent and prove they are equivalent using properties

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If c(x) = 4x – 2 and d(x) = x2 + 5x, what is (cxd)(x)

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?