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a=1
b=-12
x1 x2= pierwiastki równania
I x1-x2 I=√Δ / IaI
4=√Δ/1
√Δ=4 /²
Δ=16
Δ=b²-4ac
16=12²-4*1*c
16=144-4c
4c=144-16
c=128/4
c=32
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spr.
Δ=12²-4*1*32=144-128=16
x1=[12-4]/2=4 x2=[12+4]/2=8
8-4=4