Respostas

2013-05-13T14:43:27-03:00

x²+2x-2x-6=5x-9

Resposta:x²-5x=9

x(x-5)=9

A melhor resposta!
2013-05-13T14:45:11-03:00

(x+2)(x-3)=5x-9

 

x² -3x +2x -5 = 5x - 9

x² -3x - 5x + 2x -5 + 9

x² - 6x + 4

 

(-b ±√(b²-4ac))/2

(6 ±√(36 - 4.4))/2

(6 ±√(36 - 16))/2

(6 ±√20)/2

(6 ± 2√5)/2

 

x' = (6 + 2√5)/2

x" = (6 - 2√5)/2

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