Quadratic formula Definition and 59 Threads

Hey guys, I've tried to do this quadratic question using the formula but can't seem to get it and don't know if its right or not. x= -b+-√b^2 – 4ac / 2a a= 37.5 b= L c= L^2 Need to find X the sub X into find L in metres. Thanks in Advance

Umm... I guess I don't remember this from algebra, but I have a rather basic question. Let's say you have the expression, f(x) = 4x^2 + 5x + 1 And we want to find the roots. So, \frac{-5 \pm \sqrt{5-4(4)}}{2(4)}= \{ \frac{1}{2},-1 \} Now, if we plug these into f(x) we have...

I'm learning equilibirum in class, but I am stuck on this question. DOes anyone how how to do this problem? I use the quadratic formula but end end with answers A and B, but the correct answer is A. Can someone show me step by step how to do this problem? thanks 9. At a certain temperature...

A large dealership had been selling new cars at $6000 over the factory price. Sales have been averaging 80 cars per mouth. Because of inflation, the $6000 markup is going to be increased. The marketing manager has determined that, for every $100 increase, there will be one less car sold each...

http://www.mste.uiuc.edu/users/exner/ncsa/quad/ There's another way of writing the quadratic formula...but how do I derive the 2nd formula using the 1st one? I've tried for hours and I can't get it. I would really appreciate any help.

What do you do when Root(b^2-4ac) is negative? because you can't have a negative under a root right?

I know this is a basic question, but can someone please help me with WHEN to use the quadratic formula, i just wondered, can it be used on any quadratic?

http://mathworld.wolfram.com/QuadraticFormula.html Why is the alternate form the way it is? why is 2c the numerator and not 2a?

Quadratic formula help ... Heres the question ... your help is greatly needed and appreciated ... Markita wants to fence a rectangular plot of land along side the shore of a lake. Only 3 sides must be fenced, since the lake will form teh lake will form teh fourth side. Markita had 100m of...