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Descompuneti in factori: d) (2x² - 2x +5)² - (x² + 2x +2)².

Răspuns :

(2x^2-2x+5-[x^2+2x+2])(2x^2-2x+5+x^2+2x+2)=
(2x^2-2x+5-x^2-2x-2)(2x^2-2x+5+x^2+2x+2)=
(x^2-4x+3)(3x^2+7)