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Answer:
(4a +4b +1)(4a+4b -1)
Explanation:
16 (a + b)(a + b) - 1 = 4²*(a+b)² - 1
= [4(a+b)]² - 1²
Here, x = 4(a+b) and y = 1
= [4(a+b) -1] [4(a+b) + 1]
= [4a+4b - 1] [4a+ 4b + 1]
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