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How can you mathematically test whether a relation is a function without vertical line test?

For equations with two absolute values, eg |3x+6|>|5x+2|, do I just square the whole thing? And would the answer for the example be -1< x<2? Are there any other alternative methods?

Hi, Does anyone have a guide or know of a text book that teaches how to do Combination and Perms, I have Cambridge 3U and I cant find it. BTW can anyone reccommend a textbook which teaches the concepts really well? Thanks

Hi, I'm planning to go to Matrix for Maths EX1 in Strathfield. I've got a few questions: 1. Is it good 2. How big are the classes 3. do they progress slow Thanks

Solve: [(3m+1)/(3m-1)]-[(3m-1)/(3m+1)]=2 Answer: m=(1/3)(1+2^1/2) or m= (1/3)(1-2^1/2) I need solution

factorise: a^4+a^2b^2+b^4

My 3U tutoring teacher doesnt teach systematically, he gives me a past HSC paper which has all sorts of questions. He does teach me, but only teaches me how to do questions that come up in the papers. For example, he gives me a sheet with trig, differentiation, etc and he just teaches me how...

I am doing my dot points at the moment and I am not sure how fractional condesation works, my text book only explained liquefaction and fractional distillation. I just need someone to explain to me how fractional condensation works for separating gases.

Can someone tell me what an Active Citizen is? Its for a History assignment. Thanks in adv.