3+2x-x2=0 4x-5=0 2x2-3x=0
X²+2x+3=0 D=2²-4•3=4-12= -8 x=∅ 4x=5 x=5:4=1,25 2x²-3x=0 x(2x-3)=0 x=0 x=3:2=1,5