help please need answer fast

Without the workings, this is fucking useless! 

Note that most 'Answerers' are less inclined to provide methods of finding an answer to 'guest' posters and may just post  an answer.....

    Ever thought of signing up as a registered user?    ~EP

Cool!! Thankx EP!

Really cool! Thanks CPhill!  Man Im glad I found this math site

What do you mean by positive root.

225 / 36     has two   roots  : (-15/6)     and  (15/6)   

If we square both of these.....we get   225 /36

But.....since    "a"  is positive....we need   15 / 6    =   5   / 2

Does that make sense  ???

Oh yea! I remember the 2 roots thing from quadratic equations but I didnt know that one was a minus number. I remember some them had two plus numbers. How do you know which one to use if they are both plus numbers?

The only way that we can get two  positive roots is if we have something like this :

(x  - a)^2   =   0             take both roots

x  - a   =  0    [  both roots of   0   are  -0   and  + 0   =  0   ]

x  = a           (assuming that  a  >  0  )

I put numbers in there to see what you mean but I only understand this a little. I will work on it some more later when I have time. 

Thanks CPhill with your help I’ll pass the quiz tomorrow and maybe I’ll pass the class.