Answer:
It's C. (9a^3-10)(9a^3+10
(9a^3 + 10)(9a^3 - 10)
Explanation:
81a^6 - 100
= (9a^3)^2 - 10^2 ---->(Difference of 2 squares)
= (9a^3 + 10)(9a^3 - 10)
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