ALEX Classroom Resources

   View Standards     Standard(s): [MA2015] AL2 (9-12) 5 :

5 ) (+) Extend polynomial identities to the complex numbers.

Example: Rewrite x² + 4 as (x + 2i)(x - 2i). [N-CN8]

[MA2015] AL2 (9-12) 6 :

6 ) (+) Know the Fundamental Theorem of Algebra; show that it is true for quadratic polynomials. [N-CN9]

[MA2015] PRE (9-12) 13 :

13 ) (+) Know and apply the Binomial Theorem for the expansion of (x + y)ⁿ in powers of x and y for a positive integer n, where x and y are any numbers, with coefficients determined, for example, by Pascal's Triangle. (The Binomial Theorem can be proved by mathematical induction or by a combinatorial argument.) [A-APR5]

[MA2015] ALT (9-12) 5 :

5 ) (+) Extend polynomial identities to the complex numbers. [N-CN8]

Example: Rewrite x² + 4 as (x + 2i)(x - 2i).

[MA2015] ALT (9-12) 6 :

6 ) (+) Know the Fundamental Theorem of Algebra; show that it is true for quadratic polynomials. [N-CN9]

[MA2015] PRE (9-12) 37 :

37 ) (+) Derive the equations of ellipses and hyperbolas given the foci, using the fact that the sum or difference of distances from the foci is constant. [G-GPE3]

[MA2015] PRE (9-12) 38 :

38 ) (+) Give an informal argument using Cavalieri's principle for the formulas for the volume of a sphere and other solid figures. [G-GMD2]

Module 3, Topic A brings students back to the study of complex roots of polynomial functions.  Students briefly review quadratic and cubic functions and then extend familiar polynomial identities to both complex numbers and to general polynomial functions. Students use polynomial identities to find square roots of complex numbers. The binomial theorem and its relationship to Pascal’s Triangle are explored using roots of unity. The topic concludes with students’ use of Cavalieri’s principle to derive formulas for the volume of the sphere and other geometric solids.

Note: This module is identified as Precalculus and Advanced Topics in the EngageNY curriculum. It also corresponds to the Algebra II and Algebra II with Trigonometry Alabama Courses of Study.

   View Standards     Standard(s): [MA2015] PRE (9-12) 37 :

37 ) (+) Derive the equations of ellipses and hyperbolas given the foci, using the fact that the sum or difference of distances from the foci is constant. [G-GPE3]

In this activity from Khan Academy, students will review their knowledge of ellipse equations and their features: center, radii, and foci. This activity has an embedded video, practice problem with immediate checks for the correctness of answers, an explanation option, and more practice choice at the end of the lesson. This review can be assigned to Google Classroom. 

Khan Academy is a free resource for teachers. Teachers can sign up for a free account to access additional resources.

   View Standards     Standard(s): [MA2015] PRE (9-12) 37 :

37 ) (+) Derive the equations of ellipses and hyperbolas given the foci, using the fact that the sum or difference of distances from the foci is constant. [G-GPE3]

In this activity from Khan Academy, students will review their knowledge of the foci of an ellipse. This activity has an embedded video, practice problem with an immediate check for the correctness of the answer, an explanation option, and more practice choice at the end of the lesson. This review can be assigned to Google Classroom. 

Khan Academy is a free resource for teachers. Teachers can sign up for a free account to access additional resources.

   View Standards     Standard(s): [MA2015] PRE (9-12) 37 :

37 ) (+) Derive the equations of ellipses and hyperbolas given the foci, using the fact that the sum or difference of distances from the foci is constant. [G-GPE3]

In this instructional video and practice activity from Khan Academy, students will explore how the radii and the foci of an ellipse relate to each other and how this relationship can be used to find the foci from the equation of an ellipse. This video can be used during a lesson on solving systems of equations. The video is 13 minutes and 48 seconds in length and can be assigned through Google Classroom. There are practice problems included after the video.

Khan Academy is a free resource for teachers. Teachers can sign up for a free account to access additional resources.