algebra khanacademy

Algebra - Khan Academy

Algebra - Khan Academy

reported by (19 courses)
published
1,623 click
12,366 views
URL
HTML code

Algebra I on Khan Academy: Algebra is the language through which we describe patterns. Think of it as a shorthand, of sorts. As opposed to having to do something over and over again, algebra gives you a simple way to express that repetitive process. It's also seen as a "gatekeeper" subject. Once you achieve an understanding of algebra, the higher-level math subjects become accessible to you. Without it, it's impossible to move forward. It's used by people with lots of different jobs, like carpentry, engineering, and fashion design. In these tutorials, we'll cover a lot of ground. Some of the topics include linear equations, linear inequalities, linear functions, systems of equations, factoring expressions, quadratic expressions, exponents, functions, and ratios.

About Khan Academy: Khan Academy offers practice exercises, instructional videos, and a personalized learning dashboard that empower learners to study at their own pace in and outside of the classroom. We tackle math, science, computer programming, history, art history, economics, and more. Our math missions guide learners from kindergarten to calculus using state-of-the-art, adaptive technology that identifies strengths and learning gaps. We've also partnered with institutions like NASA, The Museum of Modern Art, The California Academy of Sciences, and MIT to offer specialized content.

For free. For everyone. Forever. #YouCanLearnAnything

Subscribe to Khan Academy’s Algebra channel:
www.youtube.com/channel/UCYZrCV8...ion=1
Subscribe to Khan Academy: www.youtube.com/subscription_cen...ademy

Lessons hide description

Why the abstraction of mathematics is so fundamental

Where did the word "Algebra" and its underlying ideas come from?

The general idea behind the word 'abstract'

Bridging algebra and geometry. What makes linear equations so linear.

Learn what variables, expressions, and equations really are. Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/math/a ...

Let's ease into this, shall we? Here's an introduction to basic algebraic equations of the form ax=b. Remember that you can check to see if you have the right answer by substituting it for the variabl ...

This example demonstrates how we solve an equation expressed such: ax + b = c. It's a little more complicated than previous examples, but you can do it! Practice this lesson yourself on KhanAcademy.o ...

Sal solves the equation 2x + 3 = 5x - 2. Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/math/a ...

Solving linear equations with variable expressions in the denominators of fractions Watch the next lesson: https://www.khanacademy.org/math/algebra ...

Graphing linear equations More free lessons at: http://www.khanacademy.org/video?v=2UrcU

Getting a feel for slope and y-intercept More free lessons at: http://www.khanacademy.org/video?v=Nhn-a

Figuring out the slope of a line

Second part of determining the slope of a line

Determining the equation of a line More free lessons at: http://www.khanacademy.org/video?v=gvwKv

Using the "Graph of a line" module to understand how a line's graph changes when its slope or y-intercept is changed. More free lessons at: http://www.khanacademy.org/video?v=8sz1I

Introduction to averages and algebra problems involving averages.

Adding sums of consecutive integers

In this example we grow a whole number by a percentage of itself. Growing by percentage is a common skill often used when figuring how much is owed or earned with interest.

We're putting a little algebra to work to find the full price when you know the discount price in this percent word problem. Practice this lesson yourself on KhanAcademy.org right now: https://www. ...

systems of equations More free lessons at: http://www.khanacademy.org/video?v=nok99

What a ratio is. Simple ratio problems. Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/math/pre-alg ...

A slightly more involved ratio problem with algebra More free lessons at: http://www.khanacademy.org/video?v=ITVQr

More advance ratio problem with algebra. More free lessons at: http://www.khanacademy.org/video?v=ItA_h

An alternate solution to the advanced ratio problem in the last video. More free lessons at: http://www.khanacademy.org/video?v=-xyTz

Basic ratio problems. (from KhanAcademy.org)

More advanced ratio problems More free lessons at: http://www.khanacademy.org/video?v=PASSD

Part 3 of the presentation on age word problems

(Ax+By)(Ax+By) More free lessons at: http://www.khanacademy.org/video?v=Sc0e6

Introduction to i and imaginary numbers Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/math/preca ...

Calculating i raised to arbitrarily high exponents Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/math/preca ...

Introduction to complex numbers. Adding, subtracting and multiplying complex numbers.

Dividing complex numbers. Complex conjugates.

Introduction to using the quadratic equation to solve 2nd degree polynomial equations

2 more examples of solving equations using the quadratic equation

Solving a quadratic by completing the square.

Deriving the quadratic formula by completing the square.

How to solve a quadratic inequality. Visual intuition of what a quadratic inequality means.

An introduction to functions. More free lessons at: http://www.khanacademy.org/video?v=VhokQ

More examples of solving function problems More free lessons at: http://www.khanacademy.org/video?v=XEblO

Even more examples of function exercises. Introduction of a graph as definition of a function. More free lessons at: http://www.khanacademy.org/video?v=5fcRS

An example of a functions problem submitted by a youtube viewer More free lessons at: http://www.khanacademy.org/video?v=rbt51

Figuring out the domain of a function Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/math/algeb ...

Proofs of the logarithm properties: A(log B) = log (B^A) and log A - log B = log (A/B)

Proof of the logarithm property log_a (B) = (log_x (B))/(log_x (A))

Dividing one polynomial into another

What are conic sections and why are they called "conic sections"? Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/math/algeb ...

Introduction to the ellipse. Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/math/algeb ...

Part 3 of the intro to hyperbolas Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/math/algeb ...

Calculating the foci (or focuses) of an Ellipse. Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/math/algeb ...

Introduction to partial fraction expansion Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/math/preca ...

A more complex problem Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/math/preca ...

Dealing with repeated factors Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/math/preca ...

Parabola as the locus of all points equidistant from a point and a line More free lessons at: http://www.khanacademy.org/video?v=ZJf9s

Finding the focus and directrix of a parabola More free lessons at: http://www.khanacademy.org/video?v=1Jm9r

Algebra word problem involving two bicycles passing each other. More free lessons at: http://www.khanacademy.org/video?v=Nx4Xk

Fun algebra word problem involving a train passing a bike. More free lessons at: http://www.khanacademy.org/video?v=P03lj

Trains passing at different rates. More free lessons at: http://www.khanacademy.org/video?v=qLLjD

3 people overtaking each other at different rates More free lessons at: http://www.khanacademy.org/video?v=LYWUH

Fun word problem that is almost a brain teaser.

Not quite a brain teaser but fun nonetheless! More free lessons at: http://www.khanacademy.org/video?v=IPJAi

Two ways to solve a rational inequality (or an inequality involving a fractional expression)

Finding the coefficients of a third degree polynomial given 2 roots and the y-intercept More free lessons at: http://www.khanacademy.org/video?v=hypi8

Figuring out the formula for fixed mortgage payments using the sum of a geometric series Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/math/preca ...

Introduction to Function Inverses Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/math/algeb ...

Function Inverse Example 1 Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/math/algeb ...

Function Inverses Example 2 Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/math/algeb ...

Function Inverses Example 3 Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/math/algeb ...

Understanding direct and inverse variation Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/math/algeb ...

Examples of variables varying directly and inversely Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/math/algeb ...

Even and odd functions Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/math/algeb ...

A possible reason why even functions are called "even" and odd functions are called "odd" Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/math/algeb ...

Getting comfortable with evaluating newly defined function operators Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/math/algeb ...

Proving an expression for the sum of all positive integers up to and including n by induction

Another way to prove the expression for the sum of all positive integers up to and including n

Some examples of writing two ratios and setting them equal to each other to solve proportion word problems Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/ma ...

Examples of how to convert basic repeating decimals to fractions Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/math/a ...

Converting more interesting repeating decimals to fractions Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/math/a ...
 

 

School Graduate School 883 views

Arithmetic - Khan Academy 38 lessons

Start here if you have very little background in math fundamentals (or just want to make sure you do). Arithmetic on Khan Academy: So you're ready to have some arithmetic fun? You've come to the ri


School School 193 views

Cell Biology : Anatomy and Physiology Lectures 5 lessons

For the complete series as well as over 200 A&P videos, lecture notes, and interactive quizzes, please visit us at MrFordsClass.net. Almost all anatomy and physiology course have the student learn ho


School Graduate School 1134 views

Statistics - Khan Academy 57 lessons

Introduction to statistics. Will eventually cover all of the major topics in a first-year statistics course (not there yet!) Probability and statistics on Khan Academy: We dare you to go through a


School Secondary School 166 views

The Science of Biology 4 lessons

High school Biology videos that I make for 10th grade Biology, 9th-10th grade Honors Biology, and Intro to the Human Body classes. Hope you find them helpful!


School Graduate School 1044 views

Cosmology and Astronomy - Khan Academy 85 lessons

Videos attempting to grasp a little bit about our Universe (many of the topics associated with "Big History")


University Mathematics 259 views

Visualizing Algebra 1,927 lessons

Throughout this course, we will use algebra to quantify and describe the world around us. Have you ever wondered how many songs can fit onto your flash drive? By the end of the course, you’ll have s...


School Graduate School 1637 views

Biology - Khan Academy 61 lessons

Covers topics seen in a first year college or high school biology course.


School Graduate School 918 views

Precalculus - Khan Academy 20 lessons

Non-trigonometry pre-calculus topics. Solid understanding of all of the topics in the "Algebra" playlist should make this playlist pretty digestible. About Khan Academy: Khan Academy offers practic


School Secondary School 163 views

DNA & RNA 7 lessons

DNA and RNA videos for high school Biology


School Graduate School 1477 views

Microeconomics and Macroeconomics - Khan Academy 130 lessons

Topics covered in an traditional college level introductory microeconomics and macroeconomics course


Web Stats

Community: 20,985 users
Active courses: 1,169
Lessons: 29,286
Data: 83 GB
Online: 14 users

News about new courses