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x²-10x + 9 = 0
delta=b²-4ac=(-10)²-4 x 1 x 9=100-36=64
pierwiastek z 64=8
x1=-b-pierw delta/2a
x1=-(-10)-8/2 x 1
x1=2/2
x1=1
x2=-b+pierw delta/2a
x2=-(-10)+8/2 x 1
x2= 18/2
x2= 9
rozwiazania 1 i 9
narazie tylko tyle