10ab - (a + 5b)² = 10ab - (a² + 10ab + 25b²) = 10ab - a² - 10ab - 25b² =
= - a² - 25b²
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10ab - (a + 5b)² = 10ab - (a² + 10ab + 25b²) = 10ab - a² - 10ab - 25b² =
= - a² - 25b²