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I send my answer about your problem but my answer is not complete my answer is 2(i)
r(x) is the remainder function
from your question the remainder is 3,1,5
so from theory 3,1,5 could write (x-3)(x-1)(x-5)
so r(x) is (x-3)*(x-1)*(x-5)=x^3-9x^2 -23x-15
If my ans wer is wrong I am sorry because I don't sure my answer
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