Question 440609
Hint: Since b^2 = (a*r)(a*r) = a^2*r^2, and r is some integer, what does this say about r^2?


Then, once you finish the proof, I'll let you write it, since it won't be beneficial to you for me to do it. Writing proofs is a skill that takes time to be learned. One tip with writing proofs is, be as concise as possible, write all your steps in sequential order, and make sure your definitions/lemmas can be backed up easily.