Question

Va rog!!!!

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

2) a) xy - 2x- 2y +4 =
b) b^2 + bc+ ac+ ab=

Answer 1

1)
(x+1)^3-(x+1)(x-2)^2=
=(x+1)[(x+1)^2-(x-2)^2]=
=(x+1)[(x+1-x+2)(x+1+x-2)]=
=(x+1)*3*(2x-1)=
=3(x+1)(2x-1)

2)
a)
xy-2x-2y+4=
=x(y-2)-2(y-2)=
=(x-2)(y-2)

b)
b^2+bc+ac+ab=
=b(b+c)+a(c+b)=
=(a+b)(b+c)


sper că te-am ajutat ;)