4) Упростите выражение (x – 2)(x + 2) – (x - 5)2.

(x - 2)(x + 2) - (x - 5)² = (x² - 2²) - (x² - 2 ⋅ x ⋅ 5 + 5²) = (x² - 4) - (x² - 10x + 25) = x² - 4 - x² + 10x - 25 = (x² - x²) + 10x + (-4 - 25) = 10x - 29

Ответ: 10x - 29