№2
5а²(2х - 3) = 5а²*2х 5а²*(-3) = 10а²х - 15а²
№3
(а - 7)( а + 7) = а² - 7² = а² - 49
№4
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Answers & Comments
№2
5а²(2х - 3) = 5а²*2х 5а²*(-3) = 10а²х - 15а²
№3
(а - 7)( а + 7) = а² - 7² = а² - 49
№4