Equation of Normal to Hyperbola in all Forms

Equation of Normal to hyperbola : $$x^2\over a^2$$ – $$y^2\over b^2$$ = 1 (a) Point form : The equation of normal to the given hyperbola at the point P($$x_1, y_1$$) is $$a^2x\over x_1$$ + $$b^2y\over y_1$$ = $$a^2+b^2$$ = $$a^2e^2$$ Example : Find the equation of normal to the hyperbola $$x^2\over 25$$ – $$y^2\over 16$$ = …