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RAhamin
@RAhamin
January 2020
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Se (x – y)2 – (x + y)2 = - 8, então x . y é igual a:
(A) 0 (D) 2
(B) -1 (E) 4
(C) -2
P.S=2 é elevado a dois
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AlexanderHossoe
(x - y)² - (x + y)² = - 8
(x² - x.y + y²) - (x² + x.y + y²) = -8
x² - x² - x.y - x.y + y^2 - y^2 = - 8
- 2.x.y = - 8
x.y = 8/2
x.y = 4
Resposta letra E (4)
1 votes
Thanks 0
RAhamin
Vou olhar o gabarito
RAhamin
A resposta no gabarito eh D
RAhamin
Da 2 porque?
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Lista de comentários
(x² - x.y + y²) - (x² + x.y + y²) = -8
x² - x² - x.y - x.y + y^2 - y^2 = - 8
- 2.x.y = - 8
x.y = 8/2
x.y = 4
Resposta letra E (4)