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(x²+x-2)(x+1)=0
x²+x-2=0 ∨ x+1=0
Δ=1-4*(-2)=9 x=-1
√Δ=3
x1=[-1-3] / 2= -4/2=-2
x2=[-1+3] /2= 2/2=1
Rozwiązaniem równania jest x = { -2 ; -1 ; 1}