Respostas

2014-07-16T18:59:36-03:00

Δ= b²-4ac
Δ= 6²- 4.1.(-7)
Δ= 36+28
Δ= 64

X=  \frac{-6+- \sqrt{64} }{2}  \\ X'=  \frac{6+8}{2}  \\ X'=  \frac{14}{2}  \\ X"= 7 \\  \\ x"=  \frac{6-8}{2}  \\ x"= -1

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