Answer: −3a^3−3a^2+a+8
Step-by-step explanation: (3a^3-7a^2+a)-(6a^3-4a^2-8)
3a^3+−7a^2+a+−1(6a^3)+−1(−4a^2)+(−1)(−8)
3a^3+−7a^2+a+−6a^3+4a^2+8
(3a^3+−6a^3)+(−7a^2+4a^2)+(a)+(8)
−3a^3+−3a^2+a+8
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