(2а - 1)² - (2а - 3)(2а + 3)=
4а² - 4а + 1 - ( 4а² - 9 )=
4а² - 4а + 1 - 4а² + 9=
-4а +10
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(2а - 1)² - (2а - 3)(2а + 3)=
4а² - 4а + 1 - ( 4а² - 9 )=
4а² - 4а + 1 - 4а² + 9=
-4а +10