Question 541682
quadratic equations -b = +/-  the Square root of  b^2 -4*a*c          
                    ---------------------------------------
                             all over 2a

so a=1 for z       b=5     and    C=4

      now, -5   +/-  square root: -5^2  -4*1*4   all equals
               = -25 +/- squ.root 25-4(1)(4)  
                     =  -25 +/- squ.root 9 all over(which means divided by)2(1)

so now, -25 +/- squ.root 9
-------------------------- :the squ root of 9 is 3, cuz 3^2=9:         
              2   



 = -25 +/- 3 
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        2         =>    now divide by 2 to get: (sorry so long, i like steps)


- 25/2  +/-  3/2             or  -12.5 +/- 3/2