Fix two of the values for a, b, and c. Make at leat 5 graphs on the same axes as you vary the third value.
The graph I will start with is:
Now I'll vary the c in ax^2+bx+c. Notice that increasing the c moves the parabola up and decreasing moves it down. The increments of movement are the same as the amount we change c.
Click HERE to see the graphs.