Q.Find the coordinates of the foci, the vertices, the eccentricity, the length of the latus rectum and the equations of the asymptotes of the hyperbola $\dfrac{x^2}{9}-\dfrac{y^2}{16}=1$.

A hyperbola is the locus of a point whose distances to two fixed foci differ, in absolute value, by a constant $2a$ (with $2a$ less than the distance between the foci, the reverse inequality from the ellipse); this gives the standard equation $x^2/a^2-y^2/b^2=1$, where $b^2=c^2-a^2$, or equivalently $b^2=a^2(e^2-1)$ in terms of the eccentricity $e=c/a$, which always exceeds $1$ for a genuine hyperbola -- again the opposite range from the ellipse. The foci sit at $(\pm c,0)=(\pm ae,0)$ and the vertices at $(\pm a,0)$, with transverse axis length $2a$, conjugate axis length $2b$, and latus-rectum length $2b^2/a$, the same formula as the ellipse's. Uniquely among the four conics, the hyperbola has two straight-line asymptotes, $y=\pm(b/a)x$, that its two branches approach ever more closely at large distance from the centre but never actually touch -- a feature that follows directly from the curve being unbounded in both directions along its transverse axis.