4(m+1)-(2m+1)^2= 4(m+1)-(2m+1)(2m+1) = 4(m+1)+(-4m2-2m-2m-1) = 4m+4+(-4m2-2m-2m-1) = 4m+4-4m2-2m-2m-1 = – 4m2 + 3
4(m+1)-(2m+1)^2= 4(m+1)-(2m+1)(2m+1) = 4(m+1)+(-4m2-2m-2m-1) = 4m+4+(-4m2-2m-2m-1) = 4m+4-4m2-2m-2m-1 = – 4m2 + 3