Question: How do I simplify or factorize the expressions below:

  1. (k-2)*(k^2+5)*(k^3-k^2+7*k+8)/(6*k*(k^2-3*k+8))
  2. (k+2)*(k^2+5)*(k^3-5*k^2+13*k-8)/(6*k*(k^2-3*k+8))
  3. k^3+3*k^2+11*k-3
  4. k^2+2*k+9
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