A function is said to be an ... Graphs of Functions. Let f ... Example 1: Show that the set of positive even integers E is countable set.
Graph the points and draw a smooth line through the points and extend it in both directions Notice that we have a minimum point which was indicated by a positive a value (a = 1). The vertex has the coordinates (-1, 0) which is what you will get if you use the formula for the x-coordinate of the vertex