Question: How to collect

Hi all,

 

I have

> y1 := sum(c[i]*x^(1/2+i), i = 0 .. 4);

                 (1/2)   1       (3/2)   3        (5/2)   5        (7/2)
     y1 := c[0] x      - - c[0] x      + -- c[0] x      - -- c[0] x     
                         2               16               96            

           35        (9/2)
        + ---- c[0] x     
          3072            

I want to collect

 

                 (1/2) 
     y1 := c[0] x      ( 1 - ............)
                       

Thanks for any help!

Mario

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