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.
Instead of being in standard form, it may look more like this: y =3 x ^2+2 x +1. You can use algebra to get it into standard form, but that requires completing the square. A shortcut is to use a formula to get h, the x-coordinate of the vertex: h = - b /2 a. Here, the a is the coefficient in front of the x-squared, or 3. The b is the coefficient in front of the x, or 2.