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cobyontiveros
07.10.2020 •
Mathematics
If (a - b)2 + (a + b)2 = 24, then a2 + b2 =
(A) 4
(B) 12
(C) 16
(D) 18
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Ответ:
(B) 12
Step-by-step explanation:Hi there !
(a - b)² + (a + b)² = 24
(a² - 2ab + b²) + (a² + 2ab + b²) = 24
a² + a² + b² + b² - 2ab + 2ab = 24
2a² + 2b² = 24 | : 2
a² + b² = 12
Good luck !
Ответ: