Respostas

A melhor resposta!
2014-05-16T17:55:21-03:00
Resolva a "distributiva" :
 3(x^{2} -1) = 24
3 x^{2} -3=24

3 x^{2} =24+3
3 x^{2} =27
 x^{2} = \frac{27}{3}
 x^{2} =9
x =  \sqrt{9}
x = 3   ou 
x = -3

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