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y=2x²-3x-2
Δ=9+16=25 √Δ=5
x1=(3-5)/4=-1/2
x2=(3+5)/4=2
y=2(x+1/2)(x-2) - postać iloczynowa
d)
y=-2x²+4x-1
Δ=16-8=8 √Δ=√8=2√2
x1=(-4-2√2)/-4=1+√2/2
x2=(-4+2√2)/-4=1-√2/2
y=-2(x-1-√2/2)(x-1+√2/2) - iloczynowa