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z ^ 2 + 2 * z +2 = 0 rezolvati in C (nr complexe)

Răspuns :

delta =2patrat-4x1x2=-4, raddelta=-2i z1=-1+i, z2=-1-2i
z²+2z+2=0
a=1  b=2     c=2
Δ=b²-4ac=2²-4*1*2=4-8=-4