Master Determining the domain of a function using interval notation

[@angelunion510]

You are the best math teacher in the world.

[@slaphappysmokey1]

Thanks for the review! I swear, if it weren't for your explanations, I wouldn't remember much of anything from high school or college! You have helped me teach and tutor my daughter with ALL her math homework! Doing Pre-Calc right now, and I have been relying on your vids for years! Fantabulous stuff! I recommend you all the time!!!

[@brianmclogan]

thank you very much, It is my pleasure to be able to help and really means a lot to me that I have been able to make a difference

[@AndreaJaydn]

Thanks for being America's Math Teacher 👍

[@perlaperalta6187]

ok but honestly this helped me understand so much , thank you !!

[@brianmclogan]

happy to hear, you are very welcome!

[@Mohamed20017]

amazing job but i have to ask about the last example, it seems wrong because if we applied any number less than -3 for example -4 or -5 it will also give us a negative number, wouldn't the correct answer be (-3, infinity) ?

[@noorakhan9081]

You’re literally the best tecaher ever THANK YOU

[@cristinaramirez9134]

Gracias! After 20 years you helped me remember in 14 minutes ❤️

[@treyhebert6948]

brian you are the G.O.A.T, literally the reason I'm not failing precal.

[@alanlucero5191]

thank you for making these videos. I've watched at least 5-6 videos of yours and it really helps.

[@bethanysass2129]

Great video, thank you! ❤ I love how descriptive you were, it really helped me understand interval notations better!

[@isabelmartinez_22]

THANK YOU FOR THESE AMAZING VIDEOS!!!! Watching this while I'm preparing myself for an exam, and man, have this helped me SO SO MUCH. Thank you once again 😃

[@brianmclogan]

happy to be able to assist you, keep up the hard work

[@svechkevin]

Thanks dude, I haven't done this in 5 years, and you helped me re-learn it in 14 minutes. U DA BEST

[@sapnamadiraju145]

Your videos have helped my child so much ..Thank You.

[@xXLeafEaterXx]

Thanks again for your vids, you move at a quick but good pace and are very clear and concise.

[@brianmclogan]

thank you! happy to help

[@bostonjackson9384]

A 7:12 shouldn't it be -5 and +3 ??? Otherwise, the way you have it they add up to positive 2 instead of negative 2. Am I wrong or missing something?

[@brianmclogan]

yes check out the pinned comment

[@Tamara-ju3lh]

The examples from 8:38 on saved my life! (Or at least my grade). Thank you!!

[@brianmclogan]

awesome! happy I included

[@FlameEnzo]

Your videos are very helpful. I'm taking online classes that are just textbook so this is really helping me. Thanks for uploading!

[@kristinabraham7711]

Sir, you are a God send. May you receive the fruits of your labor✨❤️

[@bostonjackson9384]

Extremely easy to understand and super helpful!!!

[@brianmclogan]

awesome! happy to help

[@davidadeyemo722]

What happens when x=-4 or lesser in the last example?

[@Teddygainz56890]

Best teacher ever this really helped

[@brianmclogan]

happy to be there for you

[@LilyAmericanDream]

I love the way you explain it. Thanks!

[@brianmclogan]

you are very welcome!

[@zahraaalneama9455]

Omg he is great , I really understand . Thanks for helping us

[@brianmclogan]

You are very welcome!

[@sleepn_on_me2473]

Wouldn’t ex 3 have to have brackets instead of parentheses encompassing the 7?

[@evertonsilva20able]

12:47 you cannot take a even root of a negative number so the correct answer is x>-3.

[@brianmclogan]

correct, thanks

[@andreaencarnacion1646]

hey do you have a video showing how to graph asymptote?

[@brianmclogan]

yes, too many of them, here is a playlist kzbin.info/aero/PL0G-Nd0V5ZMrL9iQ1eA9gWo1vuw-UqDXo

[@andreaencarnacion1646]

Brian McLogan thank you :)

[@lelethualwande7371]

Luv how you explain to us

[@hermelademissie2477]

Thank you! My teachers could never!

[@notsaiffffff]

Guy just nailed it

[@frankieespiritu6507]

In the first example what if f of x is 2? The function would be equal to zero right?

[@murderino3746]

You are a GOD thank you man really helped me out there.

[@jaypatterson7958]

so do you completely disregard the numerators?

[@brianmclogan]

unless there is a function with a restriction like a square root

[@myanmar_songs_feeling]

Thanks sir

[@dmbers892]

Is it me or did you get that last one wrong. Anything under the radical cannot be negative. sqrt(-6+3=-3) and you cannot get the square root of a negative number. Assuming you are dealing with real numbers.

[@brianmclogan]

+dmbers892 yes I was moving too fast the correct domain would be (3,infinity)

[@gmcdougall8104]

Yes, I was thinking the last question would be [-2, +ve infinity)

[@AP-pm9qy]

@@brianmclogan Actually wouldn't it be (-3, infinity) ? Very helpful vid btw!

[@mandarmanik5118]

Hey Brian first of all your vids are gold!! In the last one I guess the right answer would be (-inf, - 3) wouldn't it?

[@niklaskpunkt8335]

@@mandarmanik5118 no, (-2,inf)

[@rukhsanakousar9112]

Thanks a lot! I finally got it. Bless you!

[@brianmclogan]

you are very welcome! happy to be able to help you out!

[@aleeyoungee]

can you write the solution of e as (-inf,-2) U (2,inf)? would that be correct?

[@brianmclogan]

which one is e?

[@aleeyoungee]

the 5th example

[@robertsmedley8816]

thank you for posting this

[@brianmclogan]

you are very welcome!

[@Tech0611]

Thank you very much I finally understand

[@brianmclogan]

awesome! happy to help

[@mariapazyepez9211]

What if in the denominator the only value is x? So in this equation -2x=5+2/x

[@brianmclogan]

multiply by x on both sides to eliminate x from the denominator

[@kowshikrahman1193]

Thank you Brian! ;)

[@brianmclogan]

you are very welcome!

[@mrannunaki6852]

he's wearing a wire.. call the mob

[@brianmclogan]

: )

[@arvincentmendoza9989]

can somebody what is the domain of this equation ? f(x) = square root of x+1 over x-2 .

[@brianmclogan]

[-1,2)U(2,infinity)

[@jeddmau5636]

This guy is the American CrazyRussianHacker for math.

[@Miguel-qw3jw]

Are you Mr.Reed ?

[@brianmclogan]

No

[@skrisalatsanjan1974]

last one is wrong. it's [-3,infinity)

[@brianmclogan]

Will note thank you

[@lemnaiwangnawlemnu7955]

in second one range is REAL NUMBER

[@brianmclogan]

correct

[@lowcountryadventures5549]

this actually didn't help me... for the first problem my teache said that not hows ou write it (x/x>0x E all real numbers) is how she said to do it... so i don't know like at all what different teachers teach about this

[@brianmclogan]

you teacher is using set notation, this video is on interval notation, both are correct just different ways of writing. to me interval notation is more common and easier to write, however there is nothing wrong with set notation so I would make sure you understand that for your class

[@lemnaiwangnawlemnu7955]

in second one range is REAL NUMBER

[@brianmclogan]

that is correct, did say otherwise?