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(x+a)(x-a) (a+b)(-a-b) (-x-b)(x-b) (b+m)(m-b)
(ab﹣1)(ab+1) (2x﹣1)(﹣1+2x) (﹣2x﹣y)(2x﹣y) (﹣a+5)(﹣a﹣5)
[x﹣(2y+1)]2 [x+(2y﹣1)][x﹣(2y﹣1)] [(x+2y)﹣1][(x﹣2y)+1] [x+(2y+1)]2
(﹣x﹣y)(x﹣y) (﹣x+y)(﹣x﹣y) (x+y)(﹣x+y) (x﹣y)(﹣x+y)
(﹣x﹣y)(x﹣y) (﹣x+y)(﹣x﹣y) (x+y)(﹣x+y) (x﹣y)(﹣x+y)
(3a+b)(a-b) (-3a-b)(-3a+b) (3a+b)(-3a-b) (-3a+b)(3a-b)
(a+b)(a-b)=a2-b2 (x+1)(x-1)=x2-1 (2x+1)(2x-1)=2x2-1 (-a+2b)(-a-2b)=a2-4b2
(x+1)(x﹣1) (a+b)(a﹣2b) (﹣a+b)(a﹣b) (﹣m﹣n)(m+n)
(a-b)(b-a) (-1-a)(a+1) (-m+n)(-m-n) (ax+b)(a-bx)
(a+b)(a﹣b)=a2﹣b2 (x+1)(x﹣1)=x2﹣1 (2x+1)(2x﹣1)=2x2﹣1 (﹣a+b)(﹣a﹣b)=a2﹣b2
(﹣5+a)(﹣5﹣a) (a﹣b)(a+c) (a+b)(﹣a﹣b) (x+1)(2﹣x)