Răspuns :
(√10 - 3)² = (√10)² - 2×√10×3 + 3² =
= 10 - 6√10 + 9 =
= 19 - 6√10
Obs. (a - b)² = a² - 2ab + b²
= 10 - 6√10 + 9 =
= 19 - 6√10
Obs. (a - b)² = a² - 2ab + b²
(a - b)² = a² - 2ab + b²
(√10 - 3)² =
= (√10)² - 2·3√10 + 3²
= 10 - 6√10 + 9
= 19 - 6√10
(√10 - 3)² =
= (√10)² - 2·3√10 + 3²
= 10 - 6√10 + 9
= 19 - 6√10