1. 5 Questions – 5 points You have 1 minute per question. Good luck.
Jumpstart your brain!
5 Questions – 5 points
You have 1 minute per question.
Good luck.

2. REMEMBER
NO WORK
NO CREDIT

3. READY
SET
GO!

4. Show the work! Which equation has a graph that opens downward?
a) y=3x2-2 b) y=2-3x2
c) x=3y2-2 d) x=2-3y2

5. Show the work! 2) Find the vertex of the parabola with
equation y=-2(x-2)2+3.

6. Show the work! 3) Which equation has the an axis of symmetry of y=-4?
a) y=-3(x-4)2+5 b) y=-3(x+4)2+5
c) x=-3(y-4)2+5 d) x=-3(y+4)2+5

7. Show the work! 4) Which equation matches the graph? y=-(x-4)2+2
x=-(y-4)2+2
x=-(y-2)2+4

8. Show the work!
5) What is the vertex of the parabola defined by: x = –7(y + 3)2-6?

9. Pass your quiz forward.
Thank you for participating.

10. 8-2 Parabolas-Day 2

11. Recall…Graphing a Parabola
Step 1) Determine how it opens
Step 2) Draw axis of symmetry
Step 3) Plot vertex
Step 4) Plot one or two more points,
reflect & connect

12. Example: Graph y=(x-3)2-4
Since y=a(x-h)2+k, we know that a=1, h=3, k=-4
Step 1)
a=1 > 0…opens up
Step 2)
Step 3)
Vertex: (h,k)=(3,-4)
Step 4) x y 4
(4-3)2-4=-3 5
(5-3)2-4=0

13. Change to standard form…
Change y=x2+2x+2 to standard form.
Isolate where you will
complete the square
Complete the square
add (b/2)2
Write squared term
Force the - sign

14. Change to standard form…
Change y=2x2-12x+19 to standard form.
Isolate where you will
Complete the square
Factor 2 from x terms
Complete the
square
Write squared term

15. Change to standard form…
Change 4x-y2=2y+13 to standard form.
The y term is squared,
so isolate the x term
Complete the square
Write squared term
Divide by 4, force - sign

16. Change y-3x2=24x+50 to standard form
Isolate the y term
Factor 3 from the x terms
Complete the
square
Write squared term
Force the - sign

17. Graph y-3x2=24x+50 … (a=3, h=-4, k=2) Step 1) a=3 > 0…opens up
Vertex=(h,k)=(-4,2)
Step 4) x y -3
(-3--4)2+2=3 -2
(-2--4)2+2=6

18. Homework Parabola Worksheet #2
Complete the chart. When graphing, clearly label 5 points (one will be the vertex) and draw the axis of symmetry