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W(x)=0⇔(2x²+x+7)=0 ∨ (x²-5)=0 ∨ (x²+5x+6)=0
Δ=1-56=055<0 x=√5 ∨ x=-√5 Δ=25-24=1⇒√Δ=1
x1=(-5-1)/2=-3
x2=(-5+1)/2=-2
W(x)=0⇔x=-3 ∨ x=-2 ∨ x=-√5 x=√5