what two numbers add to 3 and multiply to 1.25

I  x+y=3

II x*y=1.25

 

I  x=3-y

II (3-y)*y=1.25

II -y^2+3y-1.25=0

II y^2 -3y+1.25=0

 

a=1

b=-3

c=1.25

 

y1,2=  (3+/- sqrt(9-4*1.25))/2

y1,2= (3+/-2)/2

y1=2.5  => x=3-2.5=0.5

y2=0.5 => x=3-0.5=2.5

 

 

The numbers : 0.5, 2.5

what numbers add to 3 and multiply to 1.25

a + b=3

ab    =1.25

 

a=1/2  and b=2.5   or    a=2.5 and b=1/2