Matéria: Matemática
Autor: GabrielCorrea123
Perguntado 8 anos atrás

(-2x-1).(x-2)=3x+5x ao quadrado

Respostas

respondido por: Anônimo

(- 2x - 1).(x - 2) = 3x + 5x²
- 2x² + 4x - x + 2 = 3x + 5x²
- 2x² + 3x + 2 = 3x + 5x²
- 2x² + 2 = 5x²
- 2x² - 5x² = - 2
- 7x² = - 2 (-1)
7x² = 2
x² = 2
-----
7

x = √2 √7
------
√7 √7

x' = + √14
-------
7

x" = - √14
-------
7

GabrielCorrea123: obrigado

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