1)(x-y) •(x+y)+2(x-y)
(x-y) •(x+y+2)
2)(3a-1)•(3a+1)+(3a+1)
(3a+1)•(3a-1+1)
(3a+1)•3a
3a•(3a+1)
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Answers & Comments
1)(x-y) •(x+y)+2(x-y)
(x-y) •(x+y+2)
2)(3a-1)•(3a+1)+(3a+1)
(3a+1)•(3a-1+1)
(3a+1)•3a
3a•(3a+1)