Odpowiedź:
6.3x-4
chyba o to chodzi
zad 6
(x - 1)² - (2x - 3)² = x² - 2x + 1 - 4x² + 12x - 9 = - 3x² + 10x - 8
zad 7
a)
P = (y - 6)(z + 3) = yz - 6z + 3y - 18
b)
P = 1/2 * (x - 4)(x + 1) = 1/2 * (x² - 4x + x - 4) = 1/2(x² - 3x - 4) = 1/2x² - 3/2x - 2
