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a=1 b=3 c=1
Δ=3^2-4*1*1
Δ=9-4=5
y=2x^2+4x+4
a=2 b=4 c=1
Δ=4^2-4*4*1=16-16=0
y=x^2-4x+4
a=1 b=-4 c=4
Δ=(-4)^2-4*4=16-16=0
y=-2x^2+6x-6
a=-2 b=6 c=-6
Δ=6^2-4*(-2)*(-6)=36-48=-12
y=-1/2x^2+2x+4
a=-1/2 b=2 c=4
Δ=2^2-4*(-1/2)*4=4+8=12
y=2x^2_√2x-1/4
a=2 b=√2 c=-1/4
Δ=(√2)^2-4*2*(-1/4)=2+2=4