Question

Descompuneti in factori :
a) ac-ad+bc-bd
b) x²+xy+x+y
c) a³+a²b+2ab²+2b³
d) a³-2a²-2a+4

Answer 1

a) ac-ad+bc-bd=a(c-d)+b(c-d)=(a+b)(c-d)

Answer 2

a (c-d)+b (c-d)=(a+b)(c-d)


x (x+y)+1 (x+y)=(x+1)(x+y)


a^2 (a+b)+2b^2(a+b)=(a^2+2b^2)(a+b)

a^2 (a-2)+2(a-2)=(a^2+2)(a-2)