Respostas

A melhor resposta!
2013-09-22T14:06:29-03:00
2 x^{2} =-5-7x
 2x^{2} +7x+5=0
 7^{2}-4.2.5
49-40
9
x= \frac{-7+- \sqrt{9} }{2.2}
x= \frac{-7+-3}{4}
x'= \frac{-7+3}{4}
x'= \frac{4}{4}
x'=1
x''= \frac{-7-3}{4}
x''= \frac{-10}{4}  :2
x''= \frac{-5}{2}
2 5 2