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$Subtract : 3 a^{3} + 5 a^{2} - 7 a + 10 from 6 a^{3} - 8 a^{2} + a + 10$

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$a^{3} - 3 a^{2} + 8 a$

$3 a^{3} + 13 a^{2} + 8 a$

$3 a^{3} - 13 a^{2} + 8 a$

$3 a^{3} + a^{2} - 8 a$

answer is C.

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Detailed Solution

$6 a^{3} - 8 a^{2} + a + 10 - (3 a^{3} + 5 a^{2} - 7 a + 10)$

= $3 a^{3} - 13 a^{2} + 8 a$

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