1 Derivan Oil Based Patina has now been discontinued and no longer in production. 2  Derivan CanvasJack, a unique artist quality range of stretched canvases and tensioning system. 3  Our Face & Body range has just being expanded with new Face Paint Markers and Wipes. Add even more fun to your face painting. 2  Derivan continues to expand its range of artists materials with the new, professional artist grade, Derivan Watercolours range. 3  Three new colours extends Derivan Block Ink range. 4  Just released, MM32 Light Modelling Paste a NEW modelling compound added to Matisse Mediums range.
You can think of the formula for finding the vertex of a quadratic function as being (x, y) = [(-b/2a), f(-b/2a)] . This just means that to get the y value, you have to find the x value based on the formula and then plug it back into the equation. Here's how you do it: 1  y = x 2 + 9x + 18.
Vertex of a Parabola. The vertex of a parabola is the high point or low point of the graph. The method you use to find the vertex will depend on the form in which the function is given. You will want to use one strategy when the function is given in vertex form.