Khan Academy
Khan Academy: Algebra: Fractional Exponent Expressions 3
Video simplifying a rational algebraic expression with fractional exponents and a square root. [6:32]
Khan Academy
Khan Academy: Algebra: Matrices: Matrix Multiplication (Part 2)
This lesson goes through three examples of matrix multiplication. Explains how the dimensions of matrices affect whether or not the matrices can be multiplied, how to determine if they can be multiplied, and what size the resulting...
Khan Academy
Khan Academy: Algebra: Fractional Exponent Expressions 2
Video simplifying an algebraic expression with fractional exponents and a square root. [7:32]
Khan Academy
Khan Academy: Intro to Complex Number Conjugates
An instructional video describing complex conjugates. Complex conjugates are defined and then used to simplify a problem in which a complex number is divided by another complex number. [8:03]
Khan Academy
Khan Academy: Algebra: Complex Numbers: Multiplying Complex Numbers
Video shows an example of multiplying complex numbers. [5:32]
Khan Academy
Khan Academy: Linear Algebra: Determinant and Area of a Parallelogram
Video demonstrating that the area of a parallelogram created by graphing the column vectors of a 2x2 matrix is the equivalent to the absolute value of the determinant of the matrix. Pythagorean theorem, in conjunction with calculating a...
Khan Academy
Khan Academy: Linear Algebra: Distributive Property of Matrix Products
Video shows that the distributive property is true for multiplying matrices. [9:52]
Khan Academy
Khan Academy: Algebra: Complex Numbers: Subtracting Complex Numbers
Video shows an example of subtracting complex numbers. [1:53]
Khan Academy
Khan Academy: Algebra: Complex Numbers: Dividing Complex Numbers
Video shows an example of dividing complex numbers using complex conjugates. [4:58]
Khan Academy
Khan Academy: Algebra: Conic Sections: Focus and Directrix of a Parabola 2
A video lesson that provides instruction on finding the focus and directrix of a parabola. The majority of the video shows how the formulas for the focus and directrix are derived. Then a concrete example is given and the formulas are...
Khan Academy
Khan Academy: Geometry: Ca Geometry: Pythagorean Theorem, Compass Constructions
This video tutorial demonstrates solutions to problems #51-55 of the California Geometry released state test questions. Problems address proving and using the Pythagorean theorem and compass constructions. [12:35]
Khan Academy
Khan Academy: Linear Algebra: Matrix Vector Products
Video starts with reviewing matrix notation. Defines multiplying a matrix by a vector and shows examples. Shows how the matrix-vector products can be interpreted as the dot product of column vectors with a matrix or as a weighted linear...
Khan Academy
Khan Academy: Algebra: Complex Numbers: Complex Roots From the Quadratic Formula
Video shows how to use the quadratic formula to find roots of a quadratic equation in a situation where the roots are complex. Includes showing how to verify the answers are correct solutions of the quadratic. [10:15]
Khan Academy
Khan Academy: Trigonometry: Proof: Law of Sines
Video deriving the law of sines. Includes discussion of why it is useful. [6:33]
Khan Academy
Khan Academy: Geometry: Ca Geometry: Compass Construction
Demonstrates solutions to problems #56-60 of the California Geometry released state test questions. Problems address compass constructions, slope of perpendicular lines, and using the distance formula. [12:49]
Other
Represent Data With Matrices hsn.vm.c.6
A clear introduction by a high school teacher to the fundamentals of how to use matrices to represent data, including the basics of what a matrix is. Includes lots of examples for different contexts. [8:55]
Other
Secc: Hsn cn.c.8: Extend Polynomial Identities to the Complex Numbers
This resource is from the Southeast Comprehensive Center (SECC) at the American Institute for Research which is funded by the U.S. Department of Education. The video explains Common Core Standard HSN-CN.C.8 which states: Extend...
Sophia Learning
Sophia: Finding the Equation of a Circle: Lesson 1
This lesson derives the equation for a circle starting from the distance formula. It is 1 of 9 in the series titled "Finding the Equation of a Circle." [3:58]
Sophia Learning
Sophia: Finding the Area of a Sector Using the Central Angle: Lesson 3
This lesson explains how the central angle can be used to determine the area of a sector. It is 3 of 5 in the series titled "Finding the Area of a Sector Using the Central Angle." [8:03]
Sophia Learning
Sophia: Finding the Area of a Sector Using the Central Angle: Lesson 4
This lesson explains how the central angle can be used to determine the area of a sector. It is 4 of 5 in the series titled "Finding the Area of a Sector Using the Central Angle." [4:53]
Sophia Learning
Sophia: Finding the Area of a Sector Using the Central Angle: Lesson 1
This lesson explains how the central angle can be used to determine the area of a sector. It is 1 of 5 in the series titled "Finding the Area of a Sector Using the Central Angle." [2:53]
Sophia Learning
Sophia: Finding the Equation for an Ellipse: Lesson 3
This lesson explains how to find the equation for an ellipse given its foci and vertices. It is 3 of 4 in the series titled "Finding The Equation For An Ellipse." [7:45]
Sophia Learning
Sophia: Subtracting Vector Components: Lesson 1
This lesson demonstrates how to subtract vector components. It is 1 of 2 in the series titled "Subtracting Vector Components." [10:32]
Sophia Learning
Sophia: Subtracting Vectors Using the Tail to Tip Method: Lesson 2
This lesson demonstrates how to subtract vectors using the tail-to-tip method. It is 2 of 2 in the series titled "Subtracting Vectors Using the Tail-to-Tip Method." [8:42]