Question

Descompuneti in factori:a)x^3y-xy^3
b)a(x-y)+b(y-x)
c)x^2+20x+100
d)81a^4-b^4

Answer 1

a)3xy(x-y)
b)(x-y)(a-b)
c)(x+10)^2
d)(9a^2-b^2)(9a^2+b^2)=(3a-b)(3a+b)(9a^2+b^2)