Odpowiedzi

2009-10-06T19:27:04+02:00
)-(y-1)(2y+4)=
(-y +1)(2y+4)=y+5
1 1 1
2009-10-06T19:28:50+02:00
2009-10-06T21:57:37+02:00
-(y-1)(2y+4) = - (2y² + 4y - 2y -4) = -2y²-4y+2y+4= -2y² - 2y +4