16- The equation x-1-r-y-1-r-1-r-1 represents 1- Ellipse 2- Hyperbola 3- Circle 4- None

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Range of Quadratic Expression

16. The equat...

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16. The equation {x²/(1-r)}-{y²/(1+r)}=1,r>1 represents 1. Ellipse 2. Hyperbola 3. Circle 4. None

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\frac{x^{2}}{2 - r} + \frac{y^{2}}{r - 5} + 1 = 0

\frac{x^{2}}{2 - r} + \frac{y^{2}}{r - 5} + 1 = 0

x y = 1

(x_{r}, y_{r}), r = 1, 2, 3, 4

x_{1} x_{2} x_{3} x_{4} = a, y_{1} y_{2} y_{3} y_{4} = b

a^{2} + b^{2} =

\frac{x^{2}}{r - 1} - \frac{y^{2}}{1 + r} = 1, r > 1,

\frac{x^{2}}{2 - r} + \frac{y^{2}}{r - 5} + 1 = 0

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