Math Is Fun Forum

Also theres a rule that says that for limits that go to infinity in a polynomial you can ignore all the terms but the highest degree.

Ok got it.

For exam-taking purposes, how do you decide in which side to take the element approach? Does it depend if we are talking unions or intersections?

@Luca

I looked on the back of the book and the answer they show is the same as your first attempt:

So since it shows both parts are subsets of each, they are equal.

@Daniel

Venn diagrams are not a tool to proof in Set Theory. Venn diagrams constitutes a way to visualize but you cannot prove anything with them.

Franklin, is there any method to solve this polynomials of 3 degrees and higher?

Oh thanks for pointing that out. I just took Daniel's answer for granted. So:

Solve.

Yes your right.

Very simple. Just couldnt think of it

Theres actually a formula to figuring out the sum of the angles of a polygon:

180(n-2) where n is the sides of the polygon.

Which I see he/she used by doing 180(5-2) = 540.

Your right. What do you need help with? Just checking if you were right?

If you want to find ADC you would say:

180 - (a + 60) = 180 - a - 60 = 120 - a

which is quite different from 180 - a + 60.

Did you understand all I did? As I said, every step I took is backed up by geometrical theorems which I dont recall their names. I suppose you do?