Respostas

2013-10-02T23:33:26-03:00
2x^+9x-5=0
9^-4.2.(-5)
81+40
121
x=-9+- raiz de 121 /2.2
x=-9+-11/4
x'=-9+11/4
x'=-2/4. :2
x'-1/2
x"=-9-11/4
x"=20/4
x"=5
r=nao
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