Introduction to increasing, decreasing, positive or negative intervals | Algebra I | Khan Academy

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Sal discusses there Intervals where function is increasing, decreasing, postive or negative and their graphical representation.

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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.

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Are the ones I always watch for my high school physics, chemistry, maths

xoxo-ypfc
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Isn't it fun when you try and undrestand/explain something in your own words but your math teacher says your wrong so you find a video to explain it and all the video does is say what you said.

thepotatoqueen
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I love the episodes where he uses 4 different colours on the same page. It just sparks a joy in my heart that I cannot explain.

dakshbadal
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This is why I really hate those stupid books, I'm doing Alan Weinstein Calculus 1 and its terrible written, making something so simple that you can learn in 5 min, as if it was some complicated hieroglyphics. Thank you Sal for making this world a better place.

JP-xmqf
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my teacher is terrible at teaching so I better get used to looking for lessons online:’)

mysticalmind
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khan acadamey always explains things soo much harder

whatsupwithtorii
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F'(x) or F(x) we need to choose for looking sign (+ve or -ve) ? Please answer me

alfinbasheet
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These videos are great. refreshers for finals!

chloeclevenger
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using different colours and doing it along with you helped so much

ameliakeating
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I think the positive interval f(x) was going to be a<x>b, I don't know my thought is correct or not

sushantadas
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I got a test on this today....my grade is about to drop

cruzaderfox
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only need 45 seconds to understand something my teacher has been trying to explain for weeks lmaooo

guapo
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I DONT UNDERSTAND I HAVE HOMEWORK ABOUT THIS AND IMA FAIL. HELPP MEEE

foster
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least favorite part of my algebra class so far

Coreofanapple
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how to make video like this? using what app?

badrulamin
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wonderful presentation sir.But wouldnt be point B the point of inflexion if the graph line had been more steeper through point B . I mean we can regard that point as straight line.Nor the line curves upward or curves downward at that point.

- via YTPak(.com)

MyBilal
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when khan academy is your subsitute teacher the whole semester so your teacher can coach and you don't understand khan at all

abbottdraws
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I would be ahead of my class if I understood this :, )

theasianfeggets
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Bro no way I came on an algebra I video when I’m tryna learn for ap pre calculus 😭😭👍

mew
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The intervals where this graph is increasing or decreasing would be totally different if this was the graph of F ' (x). Let's just keep that in mind. Sal did a great explanation on the graph of F (x).

obedsantos