Algebra I Help: Rationalizing the Denominator with Conjugates I

In this video, we explain the concept of a conjugate. What is a conjugate? We also deal with rationalizing the denominator of more challenging scenarios. We will need to rationalize using our new found knowledge of the conjugate.

[Carsian]

THANK YOU. My textbook just said, "This is a conjugate" and I was completely clueless about what on earth it did and why I should use it.

[dartiol]

thank you so much. Textbooks can't really explain things well:/

[maryamekhtiari]

I got so confused at 4:06 (and the answer)
 why would you put a minus in front?

[abdullahmashood]

Sir why denominator goes up to numerator in 2 -root 5

[japanuke]

I was stuck on this question on the edexcel2017 gcse sample paper, thank you!

[T.Bookiki]

My teacher does this in a much harder way thanks for the help

[mysticizzm]

Is it the same when dealing with trig?

[its._andrew]

I get the concept, it’s just my teacher refuse to teach us the one with variables in it

[noneofyourbusiness]

why is square root of 5 time square root of 5 is please please help~!