Respostas

2013-09-02T00:12:26-03:00
(2x+1)² -5(2x+1) + 4 = 0
4x² + 1 - 10x - 5 + 4 = 0
4x² - 10x - 5 + 4 + 1 = 0
4x² - 10x - 5 + 5 = 0
4x² - 10x  = 0
2x² (2x - 5) = 0
2x - 5 = 0
2x = 5
x =  \frac{5}{2}

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