привести
x^{2}=-2y" alt="y=2x^{2}+4x+1
x^{2}=-2y" align="absmiddle" class="latex-formula"> к каноническому виду
y=2x^2+4x+1 = 2(x^2+2x+1/2+1/2)-1= 2(x^2+2x+1)-1=2(x+1)^2 -1
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x^2=-2y
y=-1/2 x^2