Answer:
Explanation:
1.)
I solved for the vertex. Because the leading coefficient was negative, I knew the graph had to be concave down. This means that the vertex will give me the maximum value.
2.)
I think that graphing is a good way to visualize the graph. When you graph the line, it's easy to see where the vertex as well as the x and y intercept lies.
3.)
The shape they take depends on the leading coefficient. If it's negative, then the graph will be concave down and the vertex will be the maximum value of the graph. If the leading coefficient is positive, then the graph will be concave up and the vertex will be the minimum value of the line.