smallest to largest x, then from smallest to largest y.) x' xy - 4y - 5 y = y²x² smaller x-value X (x, y) = -1,-1 Trace T = X Determinant Δ = X Discriminant T² - 44 = Conclusion unstable spiral point. ✓x larger x-value X (x, y) = 5,5 Trace T = X Determinant Δ = X Discriminant T²-4A = Conclusion unstable spiral point ✓

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