Odpowiedzi

2009-10-15T18:15:27+02:00
(1-2x)² - (1+4x)= (1-4x²) - (1+4x) = 1-4x²-1-4x=1-4(-1)² - 1- 4(-1)²=
1-4-1+4=0
2009-10-15T19:12:55+02:00
1- 4x + 2x² - 1 - 4x=
=-8x + 2x² =
= -8 razy (-1) + 2 razy (-1)²=
=8 + 2 = 10