Question

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Answer 1

Take out all visible common factors, and then look at what's left.

Answer 2

3k^7(k-4) final answer

Answer 3

glad i can help you soo much :)

Answer 4

factor out 3k^6 you will get 3k^6(k^2-4)=3k^6(k-2)(k+2)

Answer 5

Good, just a small typo:
should read:
3k^6(k^2-4)
What's left is difference of two squares, use
(a^2-b^2)=(a+b)(a-b) to complete the factorization.