D=b^2-4ac
(m+2)^2 -4(1)(m+1)=0
m^2 + 4m +4 -4m -4 = 0
m^2=0, entonces m es igual a cero
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D=b^2-4ac
(m+2)^2 -4(1)(m+1)=0
m^2 + 4m +4 -4m -4 = 0
m^2=0, entonces m es igual a cero