Question

resolva a equeção a seguir 3x².(x²-5)=5-x²

Answer 1

$3x^4-15x^2=5-x^2\\3x^4-14x^2-5=0\\3u^2-14u-5=0\\u=5\: e \; u=-\frac{1}{3}\\x^2=5 \;ou\; x^2=-\dfrac{1}{3}\\Para \; x^2=5\ti x=\pm \sqrt{5}\\Para \; x^2=-\dfrac{1}{3} \not \in R \\\\\text{Ent\~ao a resposta \'e: }\sqrt{5} \; e\; -\sqrt{5}$

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