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2x² + 2x + 3 = 0
a = 2
b = 2
c = 4
x = [- b +/- (raiz delta)]/2a
delta = b^2 - 4.a.c
= 4 - 4(2)(3)
= 4 - 24
= - 20
razi delta = 2(raiz de 5)i
x = [ - 2 - 2(raiz de 5)i]/4
x1 = [- 1 - (raiz de 5)i]/2
x2 = [- 1 + (raiz de 5)i]/2
S = {[- 1 - (raiz de 5)i]/2, [- 1 + (raiz de 5)i]/2}