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Δ=(-√2)²-4·(-1)·4=2+16=18
√Δ=√18=3√2
u1=(√2-3√2):(-2)=-2√2:(-2)=√2
u2=(√2+3√2):(-2)=4√2:(-2)=-2√2
zaznaczasz na osi najpierw -2√ 2 a potem √2
rysujesz parabole ramionami w dół u∈(-∞,-2√2> u <√2,∞)