Respostas

2013-12-04T23:29:59-02:00
5/x - 2 = 1/4 (x - 0) 
(5/x) - 2 = (1/4)x
(5 - 2x)/x = x
  (1/4)

x² + 8x - 20 = 0 
Δ = 8² - 4(1)(20)
Δ = 144

x = (-8 +- 12)2 . 1
    x' = (-8 + 12)/2 = 2
    x" = (-8 - 12)/2 = -10
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3bx + 6bc = 7bx + 3bc
6bc - 3bc = 7bx - 3bx
       3bc = 4bx
         x = (3bc)/4b
         x = (3c)/4 


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