x^2 + x >= 0
x^2 + x =0
x(x + 1) = 0
x = 0 ; x = -1
x € (-беск. ; -1] U [0 ; +беск.)
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x^2 + x >= 0
x^2 + x =0
x(x + 1) = 0
x = 0 ; x = -1
x^2 + x >= 0
x € (-беск. ; -1] U [0 ; +беск.)