Khan Academy
Khan Academy: Pre Calculus: Polar Coordinates 2
The sequel to Polar Coordinates 1 from the Khan Academy, this segment goes through some examples on converting polar coordinates to rectangular coordinates and converting a Cartesian equation to a polar equation. Graphing is also used to...
Khan Academy
Khan Academy: Algebra: Graphs Using Slope Intercept Form
This video demonstrates how to find the equation of a line in slope-intercept form given the graph of the line. There are three examples. Practice problems available. This video is also found in the strand Algebra: ck12.org. [11:11]
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: Algebra: Complex Numbers:calculate I Raised to Arbitrary Exponents
Video shows how to write i raised to various powers as simpler problems using exponent rules and the simple powers of i rules shown in the previous video. Includes link to additional practice problems. [6:20]
Khan Academy
Khan Academy: Algebra: Complex Numbers: I as the Principal Root of 1
Video shows the logic behind why some believe that saying i is the principal root of -1 is wrong. Explains why the logic is faulty. Explains more technically the meaning of principal root. [6:44]
Khan Academy
Khan Academy: Linear Algebra: Unit Vectors
Video first introduces what a unit vector is. Shows how to construct a unit vector using scalars. Shows notation for unit vectors. [6:59]
Khan Academy
Khan Academy: Arithmetic and Pre Algebra: Subtraction Word Problem
This video shows how to solve a subtraction word problem using borrowing or regrouping. Practice problems are available. [5:09]
Khan Academy
Khan Academy: Algebra: Quadratic Functions 1
Video graphing a quadratic function by evaluating it for seven different values and plotting the resulting points. [4:04]
Khan Academy
Khan Academy: Trigonometry: Graphing Trig Functions
Video showing how to graph the sine and cosine functions from their equations with modifications to the amplitude and period. Also gives an example of determining the trigonometric function using the features of the graph. Includes link...
Khan Academy
Khan Academy: E1 and E2 Reactions: Carbocations and Rearrangements
An in-depth look at carbocations and rearrangements of carbons in organic chemistry. [11:26]
Khan Academy
Khan Academy: E1 and E2 Reactions: E2 Elimination: Stereospecificity
In this video, Sal explains stereospecificity. [8:01]
Khan Academy
Khan Academy: Algebra: Ratio and Proportion
Step-by-step instructions on how to solve ratio and proportion word problems. This video is also found in the strand Algebra: ck12.org. [10:25]
Khan Academy
Khan Academy: Small X Approximation for Small Kc
Understand when the small x approximation is useful for solving equilibrium problems. Find an example using the small x approximation when Kc is small. [9:37]
Khan Academy
Khan Academy: Small X Approximation for Large Kc
Guidelines and worked examples for using the small x approximation to solve equilibrium problems with large Kc values. [14:04]
Khan Academy
Khan Academy: Algebra: Monomial Greatest Common Factor
Video defines what a greatest common factor is and demonstrates how to determine the greatest common factor of two given monomials. [3:13]
Khan Academy
Khan Academy: Geometry: Ca Geometry: Deducing Angle Measures
Demonstrates how to solve five different problems from a released California Geometry state test that involve finding the measures of angles in different polygons. This video also appears in the Geometry: Worked Examples section. [10:58]
Khan Academy
Khan Academy: Arithmetic and Pre Algebra: Multiplication 7: More Examples
A video showing more examples of multiplication with multi-digit numbers. [6:18]
Khan Academy
Khan Academy: Arithmetic and Pre Algebra: Rounding Decimals
This video demonstrates how to round a decimal number to the nearest tenth. Practice problems are available. [1:26]
Khan Academy
Khan Academy: Arithmetic and Pre Algebra: Rounding Whole Numbers 1
This video shows how to round a five-digit number to the nearest hundred using a number line. Practice problems are available. [4:23]
Khan Academy
Khan Academy: Algebra: Evaluating a Polynomial at a Given Value
Demonstrates how to evaluate a polynomial for a given variable value. [1:09]
Khan Academy
Khan Academy: Algebra: Conic Sections: Introduction to Conic Sections
A video lesson introducing conic sections. Includes a sketch of each of the four fundamental conic sections in two dimensions. Also explains why they are called conic sections by illustrating how each is the intersection of a cone and a...
Khan Academy
Khan Academy: Arithmetic and Pre Algebra: Equivalent Fractions Example
This video shows an example of writing equivalent fractions in the context of a word problem. Practice problems are available. [5:50]
Khan Academy
Khan Academy: Arithmetic and Pre Algebra: Multiplying Whole Numbers
Two-digit by two-digit multiplication demonstrated through example in this short video. Practice problems are available. [3:18]
