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Verified answer
5a)4x^2 - 81 = (2x + 9)(2x - 9)
b)
16a^4 - 625 = (4a^2 + 25)(4a^2 - 25)
c)
12x^2 - 72
= 12(x^2 - 6)
= 12(x + V6)(x - V6)