multiply
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Answer:
16a^2 - 64b^2
Step-by-step explanation:
{(a-b)(a+b) = a^2 - b^2}
(4a-8b)(4a+8b) = (4a)^2 - (8b)^2
(4a-8b)(4a+8b) = 16a^2 - 64b^2
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