7)x²-4xy+y²
8)11n+39-4n-11 = 7n-28 = 7(n-4)
9)6ab^5 = -7
18ab^5 = 3•6ab^5 = -21
6a²b^10 = ((6ab^5)^2)/6 = 49/6
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7)x²-4xy+y²
8)11n+39-4n-11 = 7n-28 = 7(n-4)
9)6ab^5 = -7
18ab^5 = 3•6ab^5 = -21
6a²b^10 = ((6ab^5)^2)/6 = 49/6