1) m²(m+1)-(m+1)= (m+1)(m²-1)= (m+1)(m-1)(m+1)
2) 7a(a²-4)+b(a²-4)= (a²-4)(7a+b)= (a-2)(a+2)(7a+b)
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1) m²(m+1)-(m+1)= (m+1)(m²-1)= (m+1)(m-1)(m+1)
2) 7a(a²-4)+b(a²-4)= (a²-4)(7a+b)= (a-2)(a+2)(7a+b)