приобразуйте ырожения
1) ( 5а + 2b)^2
2) (2x -3y)^2
3) ( 3a + n)( n -3a)
4) (3a -2)(3a +2)
1) ( 5а + 2b)^2
2) (2x -3y)^2
3) ( 3a + n)( n -3a)
4) (3a -2)(3a +2)
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Answers & Comments
2) (2x -3y)^2=4x^2-12xy+9y^2
3) ( 3a + n)( n -3a)=n^2-9a^2
4) (3a -2)(3a +2)=9a^2-4