| by Kenneth Chase | 31 comments

Solving equations with zero product property


Jennifer Magaña

Apr 4, 2017, 11:22 pm Reply

hi…first comment

Mariela M.

Apr 4, 2017, 11:22 pm Reply

It's funny how we learned this today?. Thanks.


Apr 4, 2017, 11:46 pm Reply

Lol, at russian school this learn in sixth class

hazel salazar

Apr 4, 2017, 1:20 am Reply

lol? needed this

Blacknight Sniper

Apr 4, 2017, 4:19 pm Reply

My teacher forced us to go on khan academy and it has been total horse shit every time I go on this website I get cancer

Samyuktha Chandrasekar

Apr 4, 2017, 1:52 am Reply

Mr.Khan please let the haters hate. Your videos are so very helpful. Never stop.?

Daddy Dwight

Apr 4, 2017, 6:28 pm Reply

0 dislikes… finally YouTube makes sense.

Great Perhaps

Apr 4, 2017, 11:59 am Reply

At the age of what do you study this?

CB 33

Aug 8, 2017, 9:26 am Reply

I'm dealing with sin Theta tan Theta = 1/2tan Theta…I tried subtracting 1/2tan Theta from each side, but then I wouldn't be able to factor it out. I tried using the Quotient Identity of tan Theta, but that doesn't make sense cause 1/2tan Theta is still there on the right side of the equation when it needs to be 0. I tried subtracting sin Theta from both sides so I can factor out the left side of the equation but then the right side will never be 0. I can't. I'm tired


Aug 8, 2017, 10:33 am Reply

I am told again and again that it's illegal to divide by zero.
Then I'm told that I can factorize a rational expression by using the zero product property on numerator and the denominator.

How does this contradiction work?

Tyler Allon

Sep 9, 2017, 4:27 am Reply

Very helpful

ax3l _

Sep 9, 2017, 10:47 pm Reply

Hate the fact you dont complete your "shapes"

Alfred Mosimanegape

Sep 9, 2017, 8:40 am Reply

youtube lectures gives me better understanding yoooh!!!!!!!!!!!!!

Xavier Edits

Nov 11, 2017, 4:12 pm Reply

or x could be 0 🙂


Dec 12, 2017, 7:37 pm Reply

Im learning this today 10th grade

Ethan Meyer

Jan 1, 2018, 2:21 am Reply

what software is this

Jazmin j

Jan 1, 2018, 6:01 am Reply

If I could like this 1000 times I would…!! Thanks!

sophia kolios

Feb 2, 2018, 5:17 am Reply


Jbd319 04

Feb 2, 2018, 8:18 pm Reply

Go to channel for a sick day

Phonpiboon Srimak

May 5, 2018, 12:32 am Reply

I swear this is so easy but I can't do this in class

lil pol

Jun 6, 2018, 12:40 am Reply

Thx so much I have this on my last 9th grade final tmmr, I didn’t understand it but thx too you I get it

Ella Delmundo

Aug 8, 2018, 9:43 am Reply

Literally black board XD

mazen hatamleh

Sep 9, 2018, 4:23 pm Reply

I don’t think you understand how helpful you are. You’re literally the best!!

Booginwilla _B

Sep 9, 2018, 11:37 pm Reply

so helpful thx

Mysterious Box

Nov 11, 2018, 12:20 pm Reply


Ryan Novak

Feb 2, 2019, 2:33 am Reply

I like how he has to make these videos because the teachers are slacking off lol


Feb 2, 2019, 12:00 am Reply

I love you

lulu moran

Aug 8, 2019, 2:48 pm Reply


Nora Clarke

Aug 8, 2019, 9:32 pm Reply

How to do this but with subtraction instead of multiplication?

Tony Nomanners

Aug 8, 2019, 5:24 pm Reply

It’s sad I have to come here to learn when I have a whole professor. Thank you khan academy.

Silvester Sourn

Sep 9, 2019, 2:41 am Reply

I just got an assignment where there are no 0's in the equation. For example: _x(squared) – _x = _ – _x. Is this a fluke??

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