1. (a+1)(a-1)
2. (7+x)(7-x)
3. (2x+5)(2x-5)
4. (ab+4)(ab-4)
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Answers & Comments
1. (a+1)(a-1)
2. (7+x)(7-x)
3. (2x+5)(2x-5)
4. (ab+4)(ab-4)