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=-1,5b=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=cb=-0,2. c=-0,63x²-0,2x-0,63=0 + - +--------------|-----------------|------------------------->x -0,7 0,9_______________________________________________________________x₁=3, x₂=2/7 + - +------------|----------------|------------------------>x 2/7 3