1) (x+y)²-64= (x+y+8)(x+y-8)
2)(m+4n)²-b²= (m+4n-b)(m+4n+b)
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1) (x+y)²-64= (x+y+8)(x+y-8)
2)(m+4n)²-b²= (m+4n-b)(m+4n+b)