(2x + 3)² - (x - 1)²=4х² + 12х + 9 - (х² - 2х +1) = 4х² + 12х +9 - х² +2х - 1 = 3х² +14х +8
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(2x + 3)² - (x - 1)²=4х² + 12х + 9 - (х² - 2х +1) = 4х² + 12х +9 - х² +2х - 1 = 3х² +14х +8