(0.4х + 1)² + (0.2х - 1)(0.2х + 1) = 0.16х² + 1 + 0.8х + 0.04х² - 1 = 0.2х² + 0.8х
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(0.4х + 1)² + (0.2х - 1)(0.2х + 1) = 0.16х² + 1 + 0.8х + 0.04х² - 1 = 0.2х² + 0.8х