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x=0 lub 4x+9 =0
x=0 lub 4x=-9
x=0 lub x= - 9/4
x=0 lub x= -2,25
4x² = -9x / :4
x² = -2,5 x
x= -0,5
Delta = b²-4ac
delta=81-0
delta=81
pierw.z delty = 9
/ - kreska ułamkowa
x1=-9-9/8
x1=-18/8
x1=-9/4
x1=2i1/4
x2=-9+9/8
x2=0/8
x2= 0