Grade 8-12 
Mathematics 
(Algebra I) 
Standard 22
Students use the quadratic formula and/or factoring
techniques to determine whether the graph of a
quadratic function will intersect the x-axis in
zero, one, or two points.

 

Resources
Lesson Plans
Assessments
Algebra 1  
An Integrated Approach, Larson/Kanold/Stiff,  
2000 Edition, 
D.C. Heath and Company 

Section References 

9.5 Problem Solving 
Using the Discriminant 

12.4 Quadratic Functions 

Specific Textbook  
Web Sites 

http://www.glencoe.com/ 
sec/math/prealg/mathnet/ 

http://www.eduplace.com/ 
links/ 

http://www.eduplace.com/ 

http://www.hmco.com/ 
college/mathematics/ 
index.html 

http://www.mcdougallittell. 
com/ 

http://www.hmco.com/ 

http://www.SRA-4KIDS.com/ 

General Math  
Reference Sites 

http://www.learner.org/ 
sami/view-category.php3 
?category=math 

http://www.score.k12.ca.us/ 

http://henson.austin.apple. 
com/edres/curric.shtml 

http://school.discovery.com/ 
schrockguide/index.html 

http://www.EDsOasis.org/ 

http://www.math.com/ 

http://www.nea.org/grants/ 
free.html 

http://www.wcom.com/ 
marcopolo/ 

http://www.udel.edu/sine/ 

http://dewey.chs.chico.k12. 
ca.us/math.html 

Free Stuff 

http://www.nea.org/ 
grants/free.html 

State/National Math  
Ed Organizations 

http://www.nctm.org/ 

http://www.cde.ca.gov/ 

Calif. Dept. of Ed. Standards, Assessment, Ed. Reference. 

Calculator Reference Site 
http://www.ti.com/ 
calc/docs/calchome.html 

Previously Published Data 

1.) Students will factor a variety of quadratics. Next, they will investigate what the root means as to how many x-intercepts there are by checking it on a graphing calculator. 

2.) Students will find the discriminant value for a variety of quadratic equations. 
3.) Students will use the discriminant method to determine whether a graph intercepts the x axis in 0, 1, or 2 places. 
Previously Published Data 

1.) Students will describe what the discriminant can tell about the solution of a quadratic equation, using examples and proving their explanation by sketching a graph. 

2.) Once quadratic inequalities have been addressed, students will work in pairs to create and illustrate a textbook to instruct other students on quadratic equations. The book is to be "user-friendly."