Respostas

2014-07-16T19:36:27-03:00
4x²+12x+9=0

Δ=b²-4ac

Δ=12²-4·4·9 = 144 - 72 = 72
√Δ=√72 = 6√2

x_{1}= \frac{-12-6 \sqrt{2} }{8}= \frac{-6-3 \sqrt{2} }{4}   \\ x_{2}= \frac{-12+6 \sqrt{2} }{8}= \frac{-6+3 \sqrt{2} }{4}
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