Introduction to Quadratic Functions October 1st, 2015 2 f (x) x Ex. 1: Graph the quadratic function by plotting points from the following table of values. x f(x) -2 -1 0 1 2 does it make? What shape Does this graph have a minimum or a maximum? Where is it? What is the y-intercept? What is the x-intercept? Vocabulary Quadratic Function: A function that can be written in the form 2 . f (x) ax bx c Parabola: The shape of the graph of a quadratic function. Extrema: Minimum or maximum values of a function. Minimum: The smallest y-value of a function. Maximum: The largest y-value of a function. x-intercept: A point where a function crosses the x-axis, found by substituting in y=0. y-intercept: A point where a function crosses the y-axis, found by substituting in x=0. f (x) x 4 Ex. 2: Graph the quadratic function plotting points from a table of values. 2 by f (x) x 6x 9 Ex. 3: Graph the quadratic function by plotting points from a table of values. 2