In week 8, we learned the analyzing quadratic functions.
First of all , we should find the vertex out. It’s the most important thing in a quadratic function, and then, we should find out the x-intercept if necessary. It can help us to figure out the rough shape of the quadratic functions.
We have three forms:standard form, general form and factored form.
can tell us the vertex; can tell us the y-intercept is c; and the can tell us the x-intercept if it has.
After we have found three or more points besides the vertex, we can draw it , use smooth curves.