20070201u To calculate the focus, vertex and length of latus rectum[G-SLV]-[FOCS]/[VTX]/[LEN]Example To determine the focus, vertex and length of latus rectum for theparabola X = (Y – 2)2 + 3Use the following V-Window settings.Xmin = –1, Xmax = 10, Xscale = 1Ymin = –5, Ymax = 5, Yscale = 1m CONICSwbwcwdw6(DRAW)!5(G-SLV)1(FOCS)(Calculates the focus.)!5(G-SLV)4(VTX)(Calculates the vertex.)!5(G-SLV)5(LEN)(Calculates the length of latus rectum.)• When calculating two foci for an ellipse or hyperbolic graph, press e to calculate thesecond focus. Pressing d returns to the first focus.• When calculating two vertexes for a hyperbolic graph, press e to calculate the secondvertex. Pressing d returns to the first vertex.• Pressing e when calculating the vertices of an ellipse will calculate the next value.Pressing d will scroll back through previous values. An ellipse has four vertices.5-11-18Function Analysis
