Question

а)ab^2+cd^2-ad^2-b^2c

б)x^2y^2+1-y^2-x^2

Answer 1

$a)ab^2+cd^2-ad^2-b^2c =b^2(a-c)-d^2(a-c)=(a-c)(b-d)(b+d)$

$b) x^2y^2+1-y^2-x^2=y^2(x^2-1)-(x^2-1)=(x-1)(x+1)$$(y-1)(y+1)$