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Answered by **Guest**

(−6t3−t2−2t+9)-(-8t3+4t2-4t−5)

you need to distribute the negative sign for the second equation in ()s.

−6t3−t2−2t+9+8t3-4t2+4t+5

drop the ()s and combine like terms

−6t3−t2−2t+9+8t3-4t2+4t+5

(-6t3+8t3)(-t2-4t2)(-2t+4t)(9+5)

simplifiy

2t3+3t2+2t+14

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