Answer:
(a) -10d^4 + 17d^2s - 6s^2
Explanation:
(-2d^2 + a)(5d^2 - 6s)
= -10d^4 + 12d^2s + 5d^2s - 6s^2
= -10d^4 + 17d^2s - 6s^2
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