Odpowiedź :
(2x-3)² - 5x(x + 2)(x – 2) + 5(x – 1)(x² + x + 1)
=4x^2-8x+9-5x(x^2-4)+5(x^3+x^2+x-x^2-x-1)
=4x^2-8x+9-5x^3+20x+5x^3+5x^2+5x-5x^2-5x-5
=4x^2+12x-5
=4x^2-8x+9-5x(x^2-4)+5(x^3+x^2+x-x^2-x-1)
=4x^2-8x+9-5x^3+20x+5x^3+5x^2+5x-5x^2-5x-5
=4x^2+12x-5