4a+Graphing++quadratic+functions+in+standard+and+vertex+form

http://www.purplemath.com/modules/grphquad.htm

Graph //y// =2 //x// 2 1) Make a table of values for //y// =2 //x// 2 //x// -2 -1 0 1 3 //y//  8 2 0 2 8 2) **Plot** of the points from the table 3) **Draw** a smooth curve through the points

Graph y=1/4 (//x// +2)2 + 5

1) **Identify** the constants //a// = -1/4, //h// =-2, and //k// =5. Because //a// < 0, the parabola opens down. 2) **Plot** the vertex (//h,k// ) = (-2, 5) and draw the axis of symmetry //x// = -2. 3) **Evaluate** the function of two values of //x// //x =// **0:** //y// = -1/4 (**0** + 2)2 + 5 = 4 //x// = **2:** //y// = -1/4 (**2** + 2)2 + 5 = 1