Răspunsuri

2014-06-02T11:34:08+03:00
-4(2x-9)^{3} - (2x-9)^{2} - (4x-18) = 
-4(2x-9)^{3} - (2x-9)^{2} -4x+18=
-4(2x-9)^{3} - (2x-9)^{2} -2(2x-9)=  /: (2x-9)
-4(2x-9)^2-(2x-9)-2=
(2x-9)[- 4(2x-9)-2 ]


xy+y^{2} - a(x+y) = 
y(x+y)-a(x+y)
(x+y)(y-a)
2014-06-02T12:10:03+03:00
-4(2x-9)³-(2x-9)²-2(2x-9)=-(2x-9)[4(2x-9)²+2x-9+2]=-(2x-9)[4(4x²-36x+81)+2x-7]=-2(2x-9)(16x²-144x+324+2x-7)=-(2x-9)(16x²-122x+317)

xy+y²-a(x+y)=y(x+y)-a(x+y)=(x+y)(y-a)