C1.nb

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$a := 1 ; b := 0.7 ; c := 1 p := 1 ; q := -1 ; r := -1 ImplicitPlot[a x^2 + 2 b x y + c y^2 + p x + q y + r == 0, {x, -5, 1}]$

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$a := 1 ; b := 1.6 ; c := 1 p := 1 ; q := -1 ; r := -1 ImplicitPlot[a x^2 + 2 b x y + c y^2 + p x + q y + r == 0, {x, -3, 3}]$

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$Plot[-x^2 + 2 x + 1, {x, -1, 3}]$

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$a := 1 ; b := 1 ; c := 1 p := 1 ; q := -1 ; r := -1 ImplicitPlot[a x^2 + 2 b x y + c y^2 + p x + q y + r == 0, {x, -5, 1}]$

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Converted by Mathematica (May 18, 2004)