[tex]D:x\geq0\\\\\sqrt x-4\sqrt[4]x+4=0\\(\sqrt[4] x-2)^2=0\\\sqrt[4] x-2=0\\\sqrt[4] x=2\\x=16[/tex]
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[tex]D:x\geq0\\\\\sqrt x-4\sqrt[4]x+4=0\\(\sqrt[4] x-2)^2=0\\\sqrt[4] x-2=0\\\sqrt[4] x=2\\x=16[/tex]