- a² - 2ab - (a - b)² = - a² - 2ab - (a² - 2ab + b²) = - a² - 2ab - a² + 2ab - b² =
= - 2a² - b²
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- a² - 2ab - (a - b)² = - a² - 2ab - (a² - 2ab + b²) = - a² - 2ab - a² + 2ab - b² =
= - 2a² - b²