Q.)  (6k^2-k-4)-(6k^2-4k-13)

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Ans.1)  (6k^2-k-4)-(6k^2-4k-13)

6k^2-k-4-6k^2+4k+13

(6k^2-6k^2)+(-k+4k)+(-4+13)

0+3k+7

3k+7