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(x+1)(x-2)+(x+2)(x-3)
szybko z obliczeniami


Odpowiedź :

(x + 1)(x - 2) + (x + 2)(x - 3) =

= (x² - 2x + x - 2) + (x² - 3x + 2x - 6) =

= (x² - x - 2) + (x² - x - 6) =

= x² - x - 2 + x² - x - 6 = 2x² - 2x - 8