(5x - 7)² + (2x - 7)(2x + 7) + 50x = 25x² - 70x + 49 + 4x² - 49 + 50x =
= 29x² - 20x
x = 1 ⇒ 29x² - 20x = 29 * 1² - 20 * 1 = 29 - 20 = 9
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(5x - 7)² + (2x - 7)(2x + 7) + 50x = 25x² - 70x + 49 + 4x² - 49 + 50x =
= 29x² - 20x
x = 1 ⇒ 29x² - 20x = 29 * 1² - 20 * 1 = 29 - 20 = 9