Respostas

2014-08-31T14:10:22-03:00
[(x^2.)4 - 8.x]/4x = 13
(4x^2 - 8x)/4x = 13
[4x.(x -2)]/4x =13
x - 2 = 13
x = 15

15^2 = 225
4.225 = 900
15.8 = 120
900-120 = 780
4.15 = 60
780/60 = 78/6 = 13

Resposta: 15
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