Ineed a detailed explanation of how x^2-4x+4 factored= (x-2)(x-2) wouldnt the two negative signs cancel each other out?

Well, yes and no.  If you are multiplying two terms like (x - 2) and (x - 2), you would use the FOIL method -- first, inside, outside, last.  See the attached diagram.  The two negative signs would cancel each other out only when multiplying the last values.  Let me know if you need further explanation.

it is hard to tell without knowing the relative size of the jelly beans.

step-by-step explanation: