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**need a simpe explanations please....**

Ok

I have the following questions...

1. Let say we have a general quadratic equation ax^2 + bx + c , and let's say that D>0

therefore we have two ZEROs, or ROOTs or SOLUTIONS for the equation.

my question is WHY DO WE HAVE TO FIND the ZEROs ... why is a solution considered the values for X when y=o???

Who made that assumption? Why is that the general idea of equations?

Can you give me an application where the ZEROs play an important role.

WE ALL STUDY MATH... but there are people like me who question the purpose of the little and simple things we do ( like solving quadratic equations..)

2. WHy do we need COMPLEX NUMBERS?

3. WHY is it so hard to prove the RIEMANN HYPOTheSiS?

WHY IS IT SO IMPORTANT TO FIND A PROOF for it, provided the fact that 1 000 000 bucks are offered for that so desired proof?

I need a simple explanations...I am just a freshman i college who has infinite number of questions ;))))

thanks a lot

:)