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p=-b÷2a⇒ -4÷-2=2
q=-Δ÷4a⇒ -8÷-4=2
↓
Δ=b²-4ac⇒ 16-4×(-1)×(-2)=16-8=8
x1= -b+√Δ÷2a⇒2-√2
x2=2+√2
Postać iloczynowa: y=a(x-x1)×(x-x2)⇒ y=-(x-2-√2)×(x-2+√2)