0 \ \wedge \ a\neq-1
\\
\\4a^2-4(a^2+2a+1)>0
\\
\\4a^2-4a^2-8a-4>0/:(-4)
\\
\\2a+1<0
\\
\\2a<-1
\\
\\a<-\frac12
\\
\\a\in(-\infty,-1)\cup(-1,-\frac12)" alt="\\\Delta=(2a)^2-4(a+1)(a+1)>0 \ \wedge \ a\neq-1
\\
\\4a^2-4(a^2+2a+1)>0
\\
\\4a^2-4a^2-8a-4>0/:(-4)
\\
\\2a+1<0
\\
\\2a<-1
\\
\\a<-\frac12
\\
\\a\in(-\infty,-1)\cup(-1,-\frac12)" align="absmiddle" class="latex-formula">