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a)
a=1, b=3, c=1
Δ=3²-4*1*1=9-4=5
b)
a=1, b=4, c=4
Δ=4²-4*1*4=16-16=0
c)
a=-2, b=1, c=-3
Δ=1-4*(-2)*(-3)=1-24=-23
A) Δ=3²-4*1*1=9-4=5
B)Δ=4²-4*1*4=16-16=0
C)Δ=1²-4*(-2)*(-3)=1-24=-23