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  • Usuário do Brainly
2014-07-24T15:13:09-03:00
 \frac{x}{2} - \frac{4}{x} =1

 \frac{ x^{2}-8=2x }{2x}

 x^{2} -2x-8=0

Δ=4+32
Δ=36
√Δ=√36=6

x'= \frac{2+6}{2} = \frac{8}{2} =4

x"= \frac{2-6}{2} = \frac{-4}{2} =-2

S={ -2,4}
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