1. (х+3)²=х^2+6х+9
2. (2a-5b)²=4а^2-20аb+25b^2
3. (z-4) (z+4)=z^2-16
4. (7m+6n)(6n-7m)=36n^2-49m^2
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Answers & Comments
1. (х+3)²=х^2+6х+9
2. (2a-5b)²=4а^2-20аb+25b^2
3. (z-4) (z+4)=z^2-16
4. (7m+6n)(6n-7m)=36n^2-49m^2