Question

Find the equation of the hyperboala whose focus is at (4, 2), centre at (6, 2) and e = 2.

Answer 1

 The equation of the hyperbola with centre (x₀,y₀) is given by

\[\frac{\left( x - x_0 \right)^2}{a^2} - \frac{\left( y - y_0 \right)^2}{b^2} = 1\]

Focus = \[\left( ae + x_0 , y_0 \right)\]

\[\therefore ae = - 2\]

\[ \Rightarrow a = - 1\]

\[ b^2 = \left( 2 \right)^2 - a^2 \]

\[ \Rightarrow b^2 = \left( - 2 \right)^2 - \left( - 1 \right)^2 \]

\[ \Rightarrow b^2 = 3\]

\[\Rightarrow \frac{\left( x - 6 \right)^2}{1} - \frac{\left( y - 2 \right)^2}{3} = 1\]

\[ \Rightarrow 3 \left( x - 6 \right)^2 - \left( y - 2 \right)^2 = 3\]