Recent content by Brunno

Thank you man. That was the answer I was expecting to read too.

Ah and the answer i got was 2pi

Hello fellows, I am not sure if the answer i got this question is the correct one. Could it not be it? ∫(y+x^2*cosx)dx+(2x-y^2*sin(y))dy within the llimit of the circle x^2+y^2=1

Dear friends, I was wondering what would be the necessary amount of energy to pull out the closest electron of an iron metal. I read that the energy required for the most distant electrons of the iron metal is about 9 thousand KJ/mol. Thanks my sages@

HeLLLLP People!:)

So it should be something like: 7/2<=(z²+2)²<=63/6 I still can't see any further...:cry:

Anyone willing to help me on this one?;(

Mark44,thanks.I didn't notice it.Yes it's not sqrt(7/6) but actually 3sqrt(7/6).

Hi, I tried the second one but still doesn't seem to make it easier.How to solve it by the non neat way?

Yes: 7/2<= |t²+2tu+u²|<=63/6 But from here i can't go anywhere.I don't know from where to start to prove it.:( where t=(z+1) and u=(1-z+z²)

Hellllllp! Please!:)

Hi fellows, Homework Statement Prove that: \sqrt{\frac{7}{2}}\leq|z+1|+|1-z+z²|\leq\sqrt{\frac{7}{6}} for all complex numbers with |z|=1. Homework Equations The Attempt at a Solution I've tried something like this: Starting by the following property...

I tried this: A=n^1/2 B= n-1)^1/2 Then i squared both terms : [n^1/2 - (n-1)^1/2]² <0,0001 But i couldn't find the answer anyways.Just didn't work this way to me.

Homework Statement Somebody can help me with thi following problem: \sqrt{n} - \sqrt{n-1} < 0,01 Answer: n=2501 Homework Equations The Attempt at a Solution

Thank you so much.I had no idea it had to use third degree equation,i don't even remember how to solve a 3° equation,but that's no problem.I will just work out this cube thing and see if i have the same answer.Thanks again!