PG21-41

Today in class we...
Answered questions from Mileposts 1, 5, 6, 7 odds
Completed PG21 as a warm up activity to introduce "Graphing Form" and "Standard Form" of parabolas.

Graphing form: y=a(x-h)^2+k where a=stretch factor/orientation, h=horizontal shift, k=vertical shift.

Standard form: y=ax^2+bx+c *note: a is the same number in both graphing and standard form

After completing PG23, we summarized the process needed to change an equation from standard form to graphing form by averaging the x-intercepts.

Process:
1) find the x-intercepts by substituting y=0
2) average the x-intercepts to find the x-coordinate of the vertex
3) substitute the x-coordinate of the vertex into the equation to find the y-coordinate of the vertex
4) sketch a graph, identify a, h, and k
5) substitute a, h, and k into the graphing form of the parabola

Use this process to answer question #24 and 25.

While working on the assignment, we looked at the FX DSPA. Anyone scoring less than 80% will need to make corrections to this test on Friday.
DSPA STATS: High 100, Low 59. Mean 85.5, Median 88, Mode 99. 13 people scored lower than 80%

Homework: PG26-31, 34-41 Due Friday.