0 \\
y_{1} =6 \\
y _{2} =2 \\
x^{2} +x=6 \\
x^{2} +x-6=0 \\
D>0 \\
x_{1} =2 \\
x_{2} =-3 \\
x^{2} +x=2 \\
x^{2} +x-2=0 \\
D>0 \\
x_{3} =1 \\
x_{4} =-2" alt="( x^{2} +x) ^{2} -8( x^{2} +x)+12=0 \\
x^{2} +x=y \\
y ^{2} -8y+12=0 \\
D>0 \\
y_{1} =6 \\
y _{2} =2 \\
x^{2} +x=6 \\
x^{2} +x-6=0 \\
D>0 \\
x_{1} =2 \\
x_{2} =-3 \\
x^{2} +x=2 \\
x^{2} +x-2=0 \\
D>0 \\
x_{3} =1 \\
x_{4} =-2" align="absmiddle" class="latex-formula">