X₁=(-19-√529)/17, x₁=-3.
x₂=(-19+√529)/14, x₂=2/7
____________________________________________________________
D=0, x=-14/2, x=-7 ⇒a=1, c=0, b=14
+ +
----------------------|------------------------>x
-7
______________________________________________________
D=0, x=-12/8, x=-1,5
b=12, a=4 (8=2*4⇒a=4), c=0
+ +
---------------------|----------------------------------->x
-1,5
_____________________________________________________
x₁=-0,7. x₂=0,9
{x₁+x₂=-b {-0,7+0,9=-b
x₁ *x₂=c -0,7*0,9=c
b=-0,2. c=-0,63
x²-0,2x-0,63=0
+ - +
--------------|-----------------|------------------------->x
-0,7 0,9
_______________________________________________________________
x₁=3, x₂=2/7
+ - +
------------|----------------|------------------------>x
2/7 3