DeepConic sections

Gilbert Strang, Calculus, 3rd edition (Wellesley-Cambridge Press; MIT OpenCourseWare RES.18-001) §3.5 Parabolas, Ellipses, and Hyperbolas, #43 · Geometry · Conic sections

Show that … is the equation (squared) of a single line

This problem is about second-degree curves (conics).

Show that $x^{2} + 2 x y + y^{2} + 2 x + 2 y + 1 = 0$ is the equation (squared) of a single line.

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Gilbert Strang, Calculus, 3rd edition (Wellesley-Cambridge Press; MIT OpenCourseWare RES.18-001) · §3.5 Parabolas, Ellipses, and Hyperbolas, #43

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