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Question: hello id like some help with these problems specifically problem...

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Hello, I'd like some help with these problems, specifically problem #5. I have done some myself but I'd like to compare. Please show all the steps and justifications to have led to the answers. Thanks!

5. Prove the following statements using direct proof. (10 points each) Remember that this course is about learning how to read and write formal proofs! Use formal definitions in your proofs including the formal definitions of odd and even numbers. Saying odd times odd is odd is not sufficiently formal for our formal proofs! (a) If a is an odd integer, then a2+3a+5 is odd. An example of an incorrect proof: Let a 3, which is odd. Then a2 3a +5-32 +3.3+5 9+9+5-23, which is odd. This only verifies the result for a specific example of a. Our proof needs to show that its true for all values of a! (b) Suppose a, b, c є Z. If a2lb and blc, then a6lc. (c) If n є Z, then n2 + 3n + 6 is even. (Prove it separately for the cases n even and odd.) (d) Suppose x, y E R.Ifx2 + 5y = уг +5 r, then z = y or z+,-5. (e) If a,bE N with ged(a, b) >1, then bla or b is not prime. (f) If n is odd, then 8 (n2- 1)

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