a) (x+1)²-(y-2)²=
(x+1+y-2)(x+1-y+2)=
(x+y-1)(x-y+3)
b) (3a)²-(x-3)²=
(3a+x-3)(3a-x+3)
c) (x+2)²-(4y)²=
(x+2+4y)(x+2-4y)
d) (x+5)-(3y)²=
(x+5+3y)(x+5-3y)
e) (6x-1)²-(7a)²=
(6x-1+7a)(6x-1-7a)
f) (x-6)²-(y+z)²=
(x-6+y+z)(x-6-y-z)
g) (x-7y)²-(a+3b)²=
(x-7y+a+3b)(x-7y-a-3b)
h) (x+√5)²-(y-√2)²=
(x+√5+y-√2)(x+√5-y+√2)
