Question

\(\left(\sqrt{6-\sqrt{35}}\right)^x+\left(\sqrt{6+\sqrt{35}}\right)^x=12\)

Answer 1

Đặt \(a=\sqrt{6-\sqrt{35}};b=\sqrt{6+\sqrt{35}}\left(a;b\ge0\right)\)

Ta có hpt: \(\left\{{}\begin{matrix}a^x+b^x=12\\a^2+b^2=12\end{matrix}\right.\)\(\Rightarrow x=2\)

Vậy pt có tập nghiệm là x=2.

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Answer 2

Đặt \(\left(\sqrt{6-\sqrt{35}}\right)^x=a>0\Rightarrow\left(\sqrt{6+\sqrt{35}}\right)^x=\dfrac{1}{a}\)

Pt trở thành: \(a+\dfrac{1}{a}=12\Leftrightarrow a^2-12a+1=0\Rightarrow\left[{}\begin{matrix}a=6+\sqrt{35}\\a=6-\sqrt{35}\end{matrix}\right.\)

\(\Rightarrow\left[{}\begin{matrix}\left(\sqrt{6-\sqrt{35}}\right)^x=\left(6-\sqrt{35}\right)^{\dfrac{x}{2}}=6+\sqrt{35}\\\left(\sqrt{6-\sqrt{35}}\right)^x=\left(6-\sqrt{35}\right)^{\dfrac{x}{2}}=6-\sqrt{35}\end{matrix}\right.\)

\(\Rightarrow\left[{}\begin{matrix}\left(6-\sqrt{35}\right)^{\dfrac{x}{2}}=\left(6-\sqrt{35}\right)^{-1}\\\left(6-\sqrt{35}\right)^{\dfrac{x}{2}}=\left(6-\sqrt{35}\right)^1\end{matrix}\right.\)

\(\Rightarrow\left[{}\begin{matrix}\dfrac{x}{2}=-1\\\dfrac{x}{2}=1\end{matrix}\right.\) \(\Rightarrow x=\pm2\)