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An equation will be a quadratic curve when the expression has the following definition
[tex]y=ax^2+bx+c[/tex]We can have b and c equal to 0, but never a, therefore we have few variations like
[tex]\begin{gathered} y=ax^2+bx \\ y=ax^2+c \\ y=ax^2 \end{gathered}[/tex]All they are quadratics. Looking at the options we can see that the only function that has that definition is
[tex]y=8-3x+7x^2[/tex]Therefore the correct answer is
[tex]y=8-3x+7x^{2}[/tex]