Answer:
(5 a^2 - 4) (25 a^4 + 20 a^2 + 16)
Explanation:
Since both terms are perfect cubes, factor using the difference of cubes formula,
a^3 − b^ 3 = (a − b) (a^2 + a b + b^2) where a = 5a^2 and b = 4 .
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