Below is a graph of for c = 4, 1, 0, -1, and -4.
Notice that changing c causes a vertical shift in
What does c tell us about the y-intercept of the parabola?
What happens to the shape of the graph as a changes?
How does varying a change the minimum value of the
Why do all the parabolas have a common point?
What do you think would happen if a was 0? Click here to see if your guess was correct.
How does changing b change the vertex of the parabola?
Is there a vertical shift in the parabola? A horizontal
What point in common do the different parabolas have?
varying d appear to change the shape of the graph?
happens to the x-intercepts as d varies?
you see a correlation between d and the vertex of the graph?
that above when we changed the value of a in ,
it caused a vertical shift in the parabola. Now when we change
the value of d in , it caused a horizontal
shift in the parabola.