I got into college as a mature student and I'm doing well in all subjects except for math. I'm struggling a good bit because I never finished high school math and theres a lot of stuff they assume everyone knows but I don't. I have to study it at home so I can keep up. Its mainly quadratic equations that are giving me trouble right now. I just wanna ask a few questions that I haven't had a chance to ask in class. First of all I can't understand what the teacher means when he says "make an equation = 0". I read somewhere that quadratic equations by definition will equate to zero but I must have misunderstood what I was reading. How do I make a quad equation = 0? For example say I have this equation "2xquared - 6x - 15" how can I make that equal zero? 2.) I can't figure out how to plug equations into the quadratic formula http://home.alltel.net/okrebs/Ch1-20.gif [Broken] I know that its only the equation in the square root sign that I'm using but I still don't know which numbers to assign to b, a and c. Using this equation for example "Xsquared + 5x - 10". I was told that b is however many x's there are so b should be 5 in this case but then what about the Xsquared at the beginning? Xsquared is still x so why doesn't b represent it? I do not know which number to assign "a" in the formula and I heard that any numbers left over are assigned to c. Would I be right in assuming that all non squared x's are represented by "b", all squared x's fit into "a" and all left over non variable numbers fit into "c"? For example if I put this in the square root sign in the quadratic formula "(5)squared - 4(1)(10)" would I be on the right track? the 5 since there was 5x, the 1 since there was 1Xsquared and the 10 since that was the only non coefficient number left over. Any help at all would be greatly appreciated. This is my main obstacle at the moment.