Respostas

2013-06-03T15:58:26-03:00

(x+2)²-9=0

x2+4-9 =0

A=1                    ∆=β2-4×(a)×(c)

B=4                   ∆=12-4×(1)×(-9)

C=-9                  ∆=1+36

                          ∆=37

 

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