The answers to exercise marked [BB] can be found in the Back of the Book.
(a) [BB] Define ƒ: R → R by ƒ(x) = 3x3 + x. Graph ƒ to determine whether ƒ is one-to-one and/or onto.
(b) [BB] Define ƒ: Z → Z by ƒ (x) = 3x3 + x. Determine (with reasons) whether ƒ is one-to-one and/or onto.
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