.............................
1) -4
2) -1
3)
4)
1) (2x-1)(2x+1)
2) (m-a)(m+a)
3) (a-3y)(a+3y)
4) (7x-11a)(7x+11a)
5) (xy-1)(xy+1)
6) -(+4)(x+2)(x-2)
.............................
1)
-4
2)
-1
3)

4)

1) (2x-1)(2x+1)
2) (m-a)(m+a)
3) (a-3y)(a+3y)
4) (7x-11a)(7x+11a)
5) (xy-1)(xy+1)
6) -(
+4)(x+2)(x-2)