Domain of a Composition of Functions, Example 1. In this video, I discuss the procedure for finding the domain of a composition of functions and then find the domain of one specific example.

Domain of a Composition of Functions, Example 1. In this video, I discuss the procedure for finding the domain of a composition of functions and then find the domain of one specific example.

I haven’t seen integral notation before, I was taught to write it as: {xER|x=/=-1/2,1/3,0}. Meaning x is an Element of the Real numbers and cannot equal -1/2, 1/3, or 0. Nice video :)

@ploik21 interval notation, not integral. what you are using is called set notation. both work! : )

I could never do what he has done so clearly with my left hand

@patrickJMT Thanks.

At 3:25 you could have just raised both sides to the -1 power.

@DehXable yes, i know

If ever come to teach post 16 maths I’m just gonna play your videos.

Thank you very MUCH!!! this video will help me a lot!!! i’ll sit for my exam on this nov 2nd….. TQ Mr,,,, :")

@billfromtopgun Post-16? Like grad level math? I’m from the US, so I’ve never heard this phrase.

@alreadytakenthe3rd Any maths studied after the age of 16

@billfromtopgun Ah. I was thinking grade 16 when I read it, but now it makes sense. Thank you!

@alreadytakenthe3rd I was only kidding though, that would be a pretty lazy way to teach. But these videos are pretty amazing.

@DehXable 6 of one… 1/2 dozen of another

My teacher says we have to always simplify the function and when I do I never get the same domain :/ .. Like in this one I got the function -12x^2-x+1/x^2 and so the domain is x greater than zero :/ aren’t I supposed to get the same answer whether I simplify it or not ? Excuse my stupidity xD

Is it the same if I use comma sign instead of union sign to express the domain?

Love it! Very clear and well-explained!! Handwriting is easy to read! THANKS SO MUCH!

@roseheroine no problem, happy to help!

@TheBarneyrubble08 no problem, come back any time